Novel thiophene-containing compound and thiophene-containing compound polymer, organic electroluminescent device, production method thereof, and image display medium

ABSTRACT

An organic electroluminescent device with a pair of electrodes having an anode and a cathode, and one or more organic compound layers disposed therebetween. One of the anode or the cathode is transparent or semitransparent. One of the organic compound layers includes a charge-transporting polyester having a repeating structure containing at least one structure selected from the structures represented by the following formulae as a partial structure: 
     
       
         
         
             
             
         
       
         
         
           
             Ar represents an unsubstituted monovalent phenyl group, an unsubstituted monovalent polynuclear aromatic hydrocarbon having 2 to 10 aromatic rings, an unsubstituted monovalent fused aromatic hydrocarbon having 2 to 10 aromatic rings, or an unsubstituted monovalent fused aromatic hydrocarbon having 2 to 10 aromatic rings, or an unsubstituted monovalent aromatic heterocyclic ring; X represents a group represented by the following formula (II); T represents a bivalent straight-chain hydrocarbon group having 1 to 6 carbon atoms; k represents O; and l represents 1: 
           
         
       
    
     
       
         
         
             
             
         
       
         
         
           
             R 1  and R 2  each represent a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted aralkyl group; and n represents an integer of 1 to 10.

This is a Division of application Ser. No. 11/637,113 filed on Dec. 12,2006. The disclosure of the prior application is hereby incorporated byreference in its entirety.

BACKGROUND

1. Technical Field

The present invention relates to a thiophene-containing compound and athiophene-containing compound polymer that are useful for organicelectronic devices such as electrophotographic photoreceptor, organicelectroluminescent device, and organic transistor. More specifically, itrelates to a thiophene-containing compound and a thiophene-containingcompound polymer superior in charge-transporting and photoemittingproperties. The invention also relates to an organic electroluminescentdevice using a particular charge-transporting polyester, a method ofproducing the organic electroluminescent device, and an image displaymedium using the organic electroluminescent device.

2. Related Art

Regarding electrophotographic photoreceptors, along with recentimprovement in performance, organic photoreceptors are used morefrequently in high-speed copying machines and printers, but currentelectrophotographic photoreceptors are insufficient in performance underthe circumstance, and thus, there is an urgent demand for elongation ofthe lifetime. Although there are some charge transport layers in thecurrently mainstream low-molecular weight dispersion system that almostsatisfy the requirements in electrical properties, but the layers stillhad disadvantages in that they were still lower in mechanical strengthand susceptible to abrasion, because a low-molecular weight compound isdispersed in polymer.

Generally, a low-molecular weight charge-transporting material depositedby vacuum deposition is used in the organic electroluminescent device,but there is observed a phenomenon that a great amount of Joule's heatgenerated by operation at a high current density of several mA/cm² oftencauses morphological change of the low-molecular weightcharge-transporting material, for example by crystallization, which inturn leads to disadvantages such as deterioration in luminescencebrightness, dielectric breakdown, and consequent shortening of devicelifetime.

There are various requirements in properties, such as solubility,film-formability, mobility, heat resistance, and matching of oxidationpotential, demanded for the charge-transporting material, and thus, tosatisfy these requirements, the physical properties thereof aregenerally modified by introducing a substituent. The physical propertiesof the charge-transporting polymer have close relationship with thephysical properties of the raw material charge-transporting monomer, andthus, molecular design of the charge-transporting monomer, i.e., thelow-molecular weight material, is important. The raw material monomersfor the triarylamine polymer above include the following two monomers:

(1) Dihydroxyarylamine, and

(2) Bishydroxyalkylarylamine.

However, the dihydroxyarylamine (1) having an aminophenol structure iseasily oxidized and thus, hard to purify. In particular, it is lessstable when converted into a para-hydroxy substituted structure. Such acompound has a disadvantage that it may be lower in mobility because ofuneven distribution of the charge caused by electron withdrawal by theoxygen atom due to the structure in which the oxygen atom is directlybound to the aromatic ring.

On the other hand, the bishydroxyalkylarylamine (2) is less influencedby the electron withdrawal by the oxygen atom because of the methylenegroup present in the molecule, but is harder to prepare the monomerthereof. Specifically, reaction of a diarylamine or a diarylbenzidinewith bromoiodobenzene often gives mixed products because the bromine andiodine atoms are both reactive, resulting in lower yield of desirableproduct. In addition, the alkyllithium and ethyleneoxide used inreplacing bromine with lithium have a problem that they are morehazardous and toxic and demand caution in handling.

Further, organic electroluminescent devices prepared with the πconjugation system polymer such as PPV or the polymer containingtriphenylamine introduced on the polyphosphazene side chain describedabove had problems in color tone, light intensity, durability, andothers.

For that reason, there exists a need for development of an organicelectronic material that is easier to produce and superior in electriccharge-transporting efficiency and emission characteristics, indevelopment of organic electronic devices, such as organicelectroluminescent devices having greater luminescence brightness andsuperior in stability during repeated use.

Electroluminescent devices (hereinafter, referred to as “EL devices”),which are self-luminous all-solid-state devices and are superior invisibility and resistant to shock, are expected to find widerapplication. Inorganic fluorescent materials are mainstream productscurrently, but these materials demand an AC voltage of 200 V or more foroperation, and thus, have problems, for example, in high production costand insufficient brightness.

SUMMARY

According to an aspect of the invention, there is provided athiophene-containing compound represented by the following formula(X-1):

In formula (X-1), Ar₁ represents a substituted or unsubstitutedmonovalent aromatic group; R₁ to R₄ each independently represent ahydrogen atom, an alkyl group, a substituted or unsubstituted arylgroup, or a substituted or unsubstituted aralkyl group; and n representsan integer of 1 to 5.

According to another aspect of the invention, there is provided anorganic electroluminescent device including a pair of electrodescomposed of an anode and a cathode, and one or more organic compoundlayers disposed therebetween,

at least one of the anode or the cathode being transparent orsemitransparent;

at least one of the organic compound layers including acharge-transporting polyester having a repeating structure containing atleast one structure selected from the structures represented by thefollowing formulae (I-1) and (I-2) as a partial structure:

in formulae (I-1) and (I-2), Ar representing a substituted orunsubstituted monovalent phenyl group, a substituted or unsubstitutedmonovalent polynuclear aromatic hydrocarbon having 2 to 10 aromaticrings, a substituted or unsubstituted monovalent fused aromatichydrocarbon having 2 to 10 aromatic rings, or a substituted orunsubstituted monovalent aromatic heterocyclic ring; X representing agroup represented by the following formula (II); T representing abivalent straight-chain hydrocarbon group having 1 to 6 carbon atoms ora bivalent branched hydrocarbon group having 2 to 10 carbon atoms; and kand l each independently representing an integer of 0 or 1:

in formula (II), R¹ and R² each independently representing a hydrogenatom, a substituted or unsubstituted alkyl group, a substituted orunsubstituted aryl group, or a substituted or unsubstituted aralkylgroup; and n representing an integer of 1 to 10.

BRIEF DESCRIPTION OF THE DRAWINGS

Exemplary embodiments of the present invention will be described indetail based on the following figures, wherein:

FIG. 1 is the IR spectrum of the compound obtained in Example 1;

FIG. 2 is the NMR spectrum of the compound obtained in Example 1;

FIG. 3 is the IR spectrum of the compound obtained in Example 2;

FIG. 4 is the NMR spectrum of the compound obtained in Example 2;

FIG. 5 is the IR spectrum of the compound obtained in Example 3;

FIG. 6 is the NMR spectrum of the compound obtained in Example 3;

FIG. 7 is the IR spectrum of the compound obtained in Example 4;

FIG. 8 is the NMR spectrum of the compound obtained in Example 4;

FIG. 9 is a schematic sectional view illustrating an example of thelayer structure of an organic electroluminescent device according to anaspect of the present invention;

FIG. 10 is a schematic sectional view illustrating an example of thelayer structure of another organic electroluminescent device accordingto an aspect of the invention;

FIG. 11 is a schematic sectional view illustrating an example of thelayer structure of yet another organic electroluminescent deviceaccording to an aspect of the invention; and

FIG. 12 is a schematic sectional view illustrating an example of thelayer structure of yet another organic electroluminescent deviceaccording to an aspect of the invention;

DETAILED DESCRIPTION

The thiophene-containing compound according to an aspect of theinvention is a thiophene-containing compound represented by thefollowing formula (X-1).

In formula (X-1), Ar₁ represents a substituted or unsubstitutedmonovalent aromatic group; R₁ to R₄ each independently represent ahydrogen atom, an alkyl group, a substituted or unsubstituted arylgroup, or a substituted or unsubstituted aralkyl group; and n is aninteger of 1 to 5 (preferably, an integer of 1 to 3).

In formula (X-1) above, Ar₁ represents a substituted or unsubstitutedmonovalent aromatic group; the number of the aromatic or heterocyclicrings are not particularly limited; and specific examples there ofinclude substituted or unsubstituted phenyl groups, substituted orunsubstituted monovalent polynuclear aromatic hydrocarbons having 2 to20 aromatic rings, substituted or unsubstituted monovalent fusedaromatic hydrocarbons having 2 to 20 aromatic rings, substituted orunsubstituted monovalent aromatic heterocyclic rings, and substituted orunsubstituted monovalent aromatic group having at least one aromaticheterocyclic ring.

The polynuclear aromatic hydrocarbon means specifically a polycyclicaromatic compound defined below in an aspect of the invention. Inaddition, the fused aromatic hydrocarbon means specifically a polycyclicaromatic compound defined below in an aspect of the invention. Thus, the“polynuclear aromatic hydrocarbon” is a hydrocarbon containing two ormore aromatic rings consisting of carbon and hydrogen atoms that arebound to each other via a carbon-carbon bond. Specific examples thereofinclude biphenyl, terphenyl, and stilbene.

The “fused aromatic hydrocarbon” is a hydrocarbon compound having two ormore aromatic rings consisting of carbon and hydrogen atoms whereinneighboring aromatic rings among the two or more aromatic rings share apair of vicinal carbon atoms that are bonded to each other. Specificexamples thereof include naphthalene, anthracene, phenanthrene, pyrene,perylene, and fluorene.

Further in formula (X-1), the aromatic heterocyclic ring selected as apossible structure represented by Ar₁ is an aromatic ring containing anelement other than carbon and hydrogen. The number of the atomsconstituting the ring skeleton (Nr) may be, for example, 5 or 6. Thekind and the number of the atoms other than carbon (hetero atoms) in thering skeleton are not particularly limited, but, for example, a sulfuratom, a nitrogen atom, an oxygen atom, or the like may be used, and thering skeleton may include two or more kinds of hetero atom, and mayinclude two or more hetero atoms. Examples of heterocyclic rings havinga five-membered ring structure include thiophene, thiofin, pyrrole,furan, and a heterocyclic ring obtained by replacing the carbons at the3- and 4-positions of any of such rings with a nitrogen atom, andexamples of heterocyclic rings having a six-membered structure include apyridine ring.

Further in formula (X-1), the aromatic group containing the aromaticheterocyclic ring selected as a possible structure represented by Ar₁represents a bond group containing at least one of the aromaticheterocyclic rings described above in the atom group forming theskeleton. Although the ring may be entirely or partially conjugated, itis preferably an entirely conjugated system, from the points ofcharge-transporting efficiency and luminous efficiency.

In formula (X-1), examples of a substituent on the monovalent aromaticgroup represented by Ar₁ include a hydrogen atom, alkyl groups, alkoxygroups, a phenoxy group, aryl groups, aralkyl groups, substituted aminogroups, and halogen atoms.

The alkyl group to be substituted on the monovalent aromatic group maybe an alkyl group having 1 to 10 carbon atoms, and examples thereofinclude a methyl group, an ethyl group, a propyl group, and an isopropylgroup. The alkoxy group to be substituted on the monovalent aromaticgroup may be an alkoxy group having 1 to 10 carbon atoms, and examplesthereof include a methoxy group, an ethoxy group, a propoxy group, andan isopropoxy group.

The aryl group to be substituted on the monovalent aromatic group may bean aryl group having 6 to 20 carbon atoms, and examples thereof includea phenyl group and a toluoyl group.

The aralkyl group to be substituted on the monovalent aromatic group maybe an aralkyl group having 7 to 20 carbon atoms, and examples thereofinclude a benzyl group and a phenethyl group.

The substituent on the substituted amino group to be substituted on themonovalent aromatic group may be an alkyl group, an aryl group, or anaralkyl group, and specific examples thereof include those mentioned inthe above explanation of the alkyl, aryl, and aralkyl groups.

The alkyl group represented by any of R₁ to R₄ in formula (X-1) may bean alkyl group having 1 to 10 carbon atoms, and examples thereof includea methyl group, an ethyl group, a propyl group, and an isopropyl group.

The aryl group represented by any of R₁ to R₄ may be an aryl grouphaving 6 to 20 carbon atoms, and examples thereof include a phenyl groupand a toluoyl group.

The aralkyl group represented by any of R₁ to R₄ may be an aralkyl grouphaving 7 to 20 carbon atoms, and examples thereof include a benzyl groupand a phenethyl group.

Examples of the substituents on the alkyl group, aryl group, or aralkylgroup include alkyl groups, aryl groups, and aralkyl groups. Specificexamples thereof are as described above.

Hereinafter, exemplary compounds 1 to 37 are shown in Tables 1 to 4 asspecific examples of the thiophene-containing compound according to anaspect of the invention, which are compounds having a structurerepresented by formula (X-1), but the invention is not limited thereto.The specific examples described in Table 1 to 4 are bilaterallysymmetric with the central thiophene at the middle. In Tables 1 to 4,the first column from the left indicates the exemplary compound number;the second column indicates Ar₁ in formula (X-1); the third columnindicates R₁ in formula (X-1); the fourth column indicates R₄ in formula(X-1); the fifth column indicates the thiophene in formula (X-1) (thestructure shown in the first row in Table 1); and the sixth columnindicates the binding site of “R₄—CH₂CH₂C—” in formula (X-1).

TABLE 1 No. Ar₁ R₁ R₄

Bonding Position 1

H CH₃

3 2

CH₃ CH₃

4 3

n-C₃H₇ CH₃

4 4

CH₃ CH₃

4 5

CH₃ CH₃

4 6

n-C₃H₇ CH₃

4 7

CH₃ CH₃

4 8

CH₃ CH₃

4 9

C₆H₁₃ CH₃

4 10

H C₂H₅

4 11

CH₃ CH₃

3

TABLE 2 12

CH₃ CH₃

4 13

CH₃ CH₃

4 14

CH₃ CH₃

4 15

CH₃ CH₃

4 16

CH₃ CH₃

4 17

CH₃ CH₃

4 18

i-C₃H₇ CH₃

4 19

CH₃ CH₃

4 20

i-C₃H₇ CH₃

4 21

CH₃ CH₃

4 22

CH₃ CH₃

4

TABLE 3 23

CH₃ CH₃

4 24

H CH₃

4 25

H CH₃

4 26

CH₃ CH₃

4 27

CH₃ C₂H₅

4 28

H CH₃

4 29

CH₃ CH₃

4 30

CH₃ CH₃

4 31

CH₃ CH₃

4 32

CH₃ CH₃

4 33

CH₃ CH₃

4

TABLE 4 34

H CH₃

4 35

CH₃ CH₃

4 36

H CH₃

4 37

CH₃ CH₃

4

The thiophene-containing compound polymer according to an aspect of theinvention is a thiophene-containing compound represented by thefollowing formula (X-II-1) or (X-II-2).

In formulae (X-II-1) and (X-II-2), Y represents a bivalent hydrocarbongroup; R₅ represents a hydrogen atom, a substituted or unsubstitutedalkyl group, a substituted or unsubstituted aryl group, or a substitutedor unsubstituted aralkyl group. Z represents a bivalent hydrocarbongroup. m is a an integer of 1 to 5 (preferably, an integer of 1 to 3). pis an integer of 5 to 5,000. B and B′ each independently represent—O—(Y′—O)_(m2)—H, or —O—(Y′—O)_(m2)—CO—Z′—CO—OR₆. Y′ and Z′ eachindependently represent a bivalent hydrocarbon group; m2 is an integerof 1 to 5; and R⁶ represents a hydrogen atom, a substituted orunsubstituted alkyl group, a substituted or unsubstituted aryl group, ora substituted or unsubstituted aralkyl group. A represents a grouprepresented by the following formula (X-III).

In formula (X-III), Ar₁ represents a substituted or unsubstitutedmonovalent aromatic group; R₁ to R₃ each independently represent ahydrogen atom, a substituted or unsubstituted alkyl group, a substitutedor unsubstituted aryl group, or a substituted or unsubstituted aralkylgroup; and n is an integer of 1 to 5.

The bivalent hydrocarbon group represented by Y or Z in formulae(X-II-1) and (X-II-2) is a group selected from the groups represented bythe following formulae (IV-1) to (IV-7).

In structural formulae (IV-1) to (IV-7), R₇ and R₈ each independentlyrepresent a hydrogen atom, a substituted or unsubstituted alkyl grouphaving 1 to 4 carbon atoms, a substituted or unsubstituted alkoxy grouphaving 1 to 4 carbon atoms, a substituted or unsubstituted phenyl group,or a substituted or unsubstituted aralkyl group; each of h and i isindependently an integer of 1 to 5; each of 1 and r is independently 0or 1; each of q and j is an integer of 0 to 2, and V represents a groupselected from the following formulae (V-1) to (V-11).

In structural formulae (V-1), (V-10) and (V-11), e is an integer of 1 to5; and each of f and g is an integer of 0 to 5.

The polymerization degree p of the thiophene-containing compound polymerrepresented by formula (X-II-1) or (X-II-2) may be in the range of 5 to5,000, preferably in the range of 10 to 1,000, from the points offilm-formability, device stability, and others. The weight-averagemolecular weight Mw thereof is preferably in the range of 10,000 to300,000.

R₅ in formula (X-II-1) has the same definition as R₁ to R₄ in formula(X-1), and examples thereof may be also the same.

Each of B and B′ in formula (X-II-2) represents —O—(Y′—O)_(m2)—H, or—O—(Y′—O)_(m2)—CO—Z′—CO—OR₆. Y′, Z′, and m2 has the same definitions asabove-described Y, Z, and m respectively, and examples thereof may bealso the same.

R₆ has the same definition as R₅ above, and examples thereof may be alsothe same.

On the other hand, Ar₁, R₁ to R₄, and n in formula (X-III) have the samedefinition as Ar₁, R₁ to R₄, and n in formula (X-1) respectively, andexamples thereof may be also the same.

Hereinafter, exemplary compounds (1) to (41) are shown in Tables 5 to 6as specific examples of the thiophene-containing compound polymerrepresented by formula (X-II-1) or (X-II-2), but the invention is notlimited thereto. Among the specific examples shown in Tables 5 to 6, ifthe column for Z—the fifth column from the left—is blank, the compoundis a specific example of the thiophene-containing compound polymerrepresented by formula (X-II-1). If the column for Z—the fifth columnfrom the left—is filled, the compound is a specific examples of thethiophene-containing compound polymer represented by formula (X-II-2).The first column from the left in Tables 68 to 69 indicate an exemplarycompound number; the second column indicates A in formula (X-III), thenumber described therein corresponding to the exemplary compound numberin Tables 1 to 4; and the group A mentioned therein is a group obtainedby removing the groups “CO₂R₄” from both ends of the exemplary compoundhaving the indicated exemplary compound number to acquire bondability.When there are multiple groups for A, the third column from the leftshows the molar ratio between the groups. The fourth column from theleft shows Y in formula (X-II-1) or (X-II-2). The fifth column from theleft shows Z in formula (X-II-2). The sixth column from the left showsR₅ when the compound is a specific example of the thiophene-containingcompound polymer represented by formula (X-II-1) (i.e., when the columnfor Z is blank), and shows B and B′ when it is a specific example of thethiophene-containing compound polymer represented by formula (X-II-2).The seventh column from the left shows m in formula (X-II-1) or(X-II-2). The eighth column from the left shows p in formula (X-II-1) or(X-II-2).

TABLE 5 A R₅/ No. No Ratio Y Z B, B′ m p (1) 5 — —CH₂CH₂— — H 1 173 (2)5 —

— H 1 98 (3) 5 —

— H 1 75 (4) 5 — —CH₂CH₂—

OCH₂CH₂OH 1 95 (5) 5 — —CH₂CH₂—

OCH₂CH₂OH 1 145 (6) 6 — —CH₂CH₂— — H 1 83 (7) 8 —

— H 1 101 (8) 12 — —CH₂CH₂— — H 1 78 (9) 12 —

— H 1 46 (10) 15 — —CH₂CH₂— — H 1 173 (11) 17 —

— H 1 56 (12) 20 — —CH₂CH₂— — H 1 102 (13) 20 —

— H 1 48 (14) 22 — —CH₂CH₂— — H 1 59 (15) 22 —

— H 1 85 (16) 22 — —CH₂CH₂—

OCH₂CH₂OH 1 102 (17) 23 — —CH₂CH₂— — H 1 64 (18) 23 —

— H 1 45 (19) 23 — —CH₂CH₂—

OCH₂CH₂OH 1 148 (20) 24 — —CH₂CH₂— — H 1 68

TABLE 6 (21) 26 — —CH₂CH₂— — H 1 96 (22) 26 —

— H 1 79 (23) 26 —

— H 1 100 (24) 26 — —CH₂CH₂— OCH₂CH₂OH 1 86 (25) 27 — —CH₂CH₂— — H 1 112(26) 29 — —CH₂CH₂— — H 1 72 (27) 29 —

— H 1 102 (28) 29 —

— H 1 100 (29) 30 — —CH₂CH₂— — H 1 67 (30) 30 —

— H 1 87 (31) 32 —

— H 1 86 (32) 32 —

— H 1 96 (33) 34 — —CH₂CH₂— — H 1 75 (34) 34 —

— H 1 96 (35) 36 — —CH₂CH₂— — H 1 93 (36) 36 —

— H 1 89 (37)  1/10 1/1 —CH₂CH₂— — H 1 77 (38)  1/10 1/1

— H 1 110 (39)  1/14 1/1 —CH₂CH₂— — H 1 106 (40) 14/17 1/1 —CH₂CH₂— — H1 100 (41) 14/24 1/1 —CH₂CH₂— — H 1 66

The thiophene-containing compound and the thiophene-containing compoundpolymer according to an aspect of the invention are prepared, forexample, in the following manner:

(1) A diarylamine is prepared in reaction of an arylamine with ahalogenated carbalkoxyalkylbenzene or in reaction of an aryl halide witha carboalkoxyaniline, and the diarylamine is then allowed to react witha bis-halogenated aryl.

(2) A diarylamine is prepared in reaction of an arylamine or a benzidinederivative with a halogenated carbalkoxyalkylbenzene, and thediarylamine is allowed to react with an aryl halide.

A method of preparing a charge-transporting material containing analkylene carboxylic ester group is described in JP-A No. 5-80550, themethod including introducing a chloromethyl group, forming its Grignardreagent with Mg, converting it into a carboxylic acid with carbondioxide, and esterifying the product. However, it is not possible by themethod to introduce the chloromethyl group into the raw material at theinitial phase because the reactivity of the chloromethyl group is high.Accordingly, the following scheme is required: i) chloromethylate themethyl group introduced, for example, into the raw material in the earlystage after formation of a skeleton such as triarylamine ortetraarylbenzidine; or ii) use an unsubstituted raw material in the rawmaterial stage, introduce a functional group such as a formyl group intothe aromatic ring in substitution reaction after formation of atetraarylbenzidine skeleton, reduce it into alcohol, and convert it intoa chloromethyl group by using a halogenating agent such as thionylchloride; or iii) directly chloromethylate the skeleton, for example,with paraformaldehyde and hydrochloric acid.

However, because charge-transporting materials having a skeleton such astriarylamine or tetraarylbenzidine are highly reactive, use of themethod of chloromethylating a previously introduced methyl group oftenresults in halogen substitution on the aromatic ring, and thus, it ispractically impossible to chlorinate only the methyl group selectively.In addition, use of the method of using an unsubstituted raw material,introducing a functional group such as a formyl group and thenconverting it into a chloromethyl group or the method of directchloromethylation often results in introduction of the chloromethylgroup only at the position para to the nitrogen atom, and consequently,the alkylene carboxylic ester group is also introduced only at theposition para to the nitrogen atom.

In addition, the method of introducing a formyl group and thenconverting it into a chloromethyl group has more reaction steps. Incontrast, the method of obtaining a monomer in reaction of an arylamine,a diarylbenzidine, or the like with a halogenatedcarbalkoxyalkylbenzene, which is advantageous in that it is easy tomodify the position of the substituent and control the ionizationpotential or the like, enables control of the resultant compound. Themonomer used in the preparation in an aspect of the invention enableseasy introduction of various substituents at arbitrary positions and ischemically stable and easy to handle, and thus reduces the problemsdescribed above.

The method of producing a thiophene-containing compound according to anaspect of the invention will be described specifically below. In anaspect of the invention, for example, a diarylamine represented by thefollowing formula (X-X) can be prepared in coupling reaction of ahalogenated compound represented by the following formula (X-VI) and anacetamide compound represented by the following formula (X-VII) in thepresence of a copper catalyst or in coupling reaction of an acetamidecompound represented by the following formula (X-VIII) with ahalogenated compound represented by the following formula (X-IX) in thepresence of a copper catalyst, and then, a thiophene compound isobtained in coupling reaction of the diarylamine (X) with adihalogenated compound represented by the following formula (X-XI) inthe presence of a copper catalyst.

[in formula (X-VI), R₉ represents a hydrogen atom, an alkyl group, asubstituted or unsubstituted aryl group, or a substituted orunsubstituted aralkyl group; and G represents a bromine or iodine atom].

Ar₁—NHAc  Formula (X-VII)

[in formula (X-VII), Ar₁ has the same definition as Ar₁ in formula (X-1)or (X-III) and exemplary range thereof may be also the same; and Acrepresents an acetyl group].

[in formula (X-VIII), R⁹ represents a hydrogen atom, an alkyl group, asubstituted or unsubstituted aryl group, or a substituted orunsubstituted aralkyl group; and Ac represents an acetyl group].

Ar₁-G  Formula (X-IX)

[in formula (X-IX), Ar₁ has the same definition as Ar₁ in formula (X-1)or (X-III), and exemplary range thereof may be also the same; and G hasthe same definition as G in formula (X-VI), and exemplary range thereofmay be also the same].

[In formula (X-X), Ar₁ has the same definition as Ar₁ in formula (X-1)or (X-III), and exemplary range thereof may be also the same; and R₉ hasthe same definition as R₉ in formula (X-VI) or (X-VIII), and exemplaryrange thereof may be also the same].

[In formula (X-XI), n and R₁ to R₃ have the same definitions as n and R₁to R₃ in formula (X-1) or (X-III), respectively, and exemplary rangesthereof may be also the same; and G has the same definition as G informula (X-VI) or (X-IX), and exemplary range thereof may be also thesame].

In the coupling reaction, the halogenated compound represented byformula (X-VI) or (X-IX) may be used in an amount of preferably 0.5 to1.5 equivalents, more preferably 0.7 to 1.2 equivalents, with respect to1 equivalent of the acetamide compound represented by formula (X-VII) or(X-VIII). The copper catalyst for use is, for example, copper powder,cuprous oxide, copper sulfate, or the like, and may be used in an amountof preferably 0.001 to 3 parts by weight, more preferably 0.01 to 2parts by weight, with respect to 1 part by weight of the acetamidecompound represented by formula (X-VII) or (X-VIII).

The base for use is, for example, sodium hydroxide, potassium hydroxide,sodium carbonate, potassium carbonate, or the like, and may be used inan amount of preferably 0.5 to 3 equivalents, more preferably 0.7 to 2equivalents, with respect to 1 equivalent of the acetamide compoundrepresented by formula (X-VII) or (X-VIII).

The coupling reaction does not always demand a solvent, but examples ofthe solvent, when used, include high-boiling point water-insolublehydrocarbon solvents such as n-tridecane, tetralin, p-cymene, andterpinolene; and high-boiling point halogenated solvents such aso-dichlorobenzene and chlorobenzene. The solvent may be used in anamount of preferably in the range of 0.1 to 3 parts by weight, morepreferably 0.2 to 2 parts by weight, with respect to 1 part by weight ofthe acetamide compound represented by formula (X-VII) or (X-VIII).

The reaction is carried out, for example, under an inert gas atmospheresuch as of nitrogen or argon in a temperature range of preferably 100 to300° C., more preferably 150 to 270° C., and still more preferably 180to 230° C., while stirred sufficiently and efficiently. The reaction maybe carried out while removing water generated during the reaction. Theproduct is cooled as needed after reaction, and the product ishydrolyzed by using a solvent such as methanol, ethanol, n-octanol,ethylene glycol, propylene glycol, or glycerol and a base such as sodiumhydroxide or potassium hydroxide. In such a case, the amount of thesolvent to be used is 0.5 to 10 parts by weight, preferably 1 to 5 partsby weight, with respect to 1 part by weight of the acetamide compoundrepresented by formula (X-VII) or (X-VIII), and the amount of the baseto be used is preferably 0.2 to 5 parts by weight, more preferably 0.3to 3 parts by weight with respect to 1 part by weight of the acetamidecompound represented by formula (X-VII) or (X-VIII).

The hydrolysis reaction is carried out by adding a solvent and a basedirectly to the reaction solution after the coupling reaction andstirring the mixture sufficiently and efficiently under an inert gasatmosphere such as of nitrogen or argon in a temperature range from 50°C. to the boiling point of the solvent. In such a case, because acarboxylate salt is generated in the coupling reaction and solidifies,use of a high-boiling point solvent having a boiling point of 150° C. orhigher is preferable to raise the reaction temperature, and addition ofa water-soluble solvent such as ethylene glycol, propylene glycol, orglycerol is preferable for liberating the diarylamine compoundrepresented by formula (X-X) after injection into water andneutralization, for example with hydrochloric acid, in post-treatment.The diarylamine compound represented by formula (X-X) is liberated bypouring the reaction product into water after completion of thehydrolysis reaction and neutralizing the solution with hydrochloric acidor the like; it is then washed thoroughly and is dissolved, as needed,in a suitable solvent, and purified, for example, by i) being subjectedto column chromatography with silica gel, alumina, activated clay,activated carbon, or the like, or ii) adsorbing undesirable componentsthrough addition of such an adsorbent into the solution, andrecrystallizing the target compound using a suitable solvent such asacetone, ethanol, ethyl acetate, or toluene, or iii) being processed ina similar manner to the above after conversion, for example, to a methylor ethyl ester thereof.

Then, the diamine compounds represented by formula (X-1) can be obtainedby coupling the diarylamine compound represented by formula (X-X)obtained with the halogenated compound represented by formula (X-XI) inthe presence of a copper catalyst and esterifying the product into itsmethyl ester, ethyl ester, or the like, or by esterifying thediarylamine compound represented by formula (X-X) into its methyl ester,ethyl ester, or the like, and coupling it with the dihalogenatedcompound represented by formula (X-XI) in the presence of a coppercatalyst.

In the coupling reaction between the diarylamine compound represented byformula (X-X) and the halogenated compound represented by formula(X-XI), when a halogen disubstituted monomer is used as the compoundrepresented by formula (X-XI), the dihalogenated compound represented byformula (X-XI) may be used in an amount of preferably 1.5 to 5equivalents, more preferably 1.7 to 4 equivalents, with respect to 1equivalent of the compound represented by formula (X-X).

The copper catalyst for use is, for example, copper powder, cuprousoxide, copper sulfate, or the like, and may be used in an amount ofpreferably 0.001 to 3 parts by weight, more preferably 0.01 to 2 partsby weight, with respect to 1 part by weight of the diarylamine compoundrepresented by formula (X-X).

The base for use is, for example, sodium hydroxide, potassium hydroxide,sodium carbonate, potassium carbonate, or the like, and may be used inan amount of preferably 1 to 6 equivalents, more preferably 1.4 to 4equivalents, with respect to 1 equivalent of the compound represented byformula (X-X).

Examples of the solvent to be optionally used include high-boiling pointwater-insoluble hydrocarbon solvents such as n-tridecane, tetralin,p-cymene, and terpinolene; high-boiling point halogenated solvents suchas o-dichlorobenzene and chlorobenzene, and the solvent may be used inan amount of preferably 0.1 to 3 parts by weight, more preferably 0.2 to2 parts by weight, with respect to 1 part by weight of the diarylaminecompounds represented by formula (X-X). The reaction may be carried outunder an inert gas atmosphere such as of nitrogen or argon at atemperature of preferably 100 to 300° C., more preferably 150 to 270°C., still more preferably 180 to 250° C., while stirring the mixturesufficiently and efficiently and removing water generated duringreaction.

After termination of the reaction, the reaction product is dissolved ina solvent such as toluene, Isopar, or n-tridecane and, as needed,undesirable components may be removed by washing with water orfiltration. Then, the product may be further purified, for example, bycolumn chromatography with silica gel, alumina, activated clay,activated carbon, or the like, or by adding such an adsorbent into thesolution to adsorb undesirable components and recrystallizing the targetcompound using a suitable solvent such as ethanol, ethyl acetate, ortoluene.

When a halogen mono-substituted compound is used as the compoundrepresented by formula (X-XI) for use in the coupling reaction, thehalogenated compound represented by formula (X-XI), a copper catalyst, abase, and optionally, a solvent are used. Examples of the coppercatalyst include copper powder, ferrous oxide, and copper sulfate, andthe catalyst may be used in an amount of preferably 0.001 to 3 parts byweight, more preferably 0.01 to 2 parts by weight, with respect to 1part by weight the diarylamine compound represented by formula (X-X).

The base for use is, for example, sodium hydroxide, potassium hydroxide,sodium carbonate, potassium carbonate, or the like, and may be used inan amount of 0.5 to 3 equivalents, preferably 0.7 to 2 equivalents, withrespect to 1 equivalent of the diarylamine compound represented byformula (X-X). The solvent is, for example, a high-boiling pointwater-insoluble hydrocarbon solvent such as n-tridecane, tetralin,p-cymene, or terpinolene, or a high-boiling point halogenated solventsuch as o-dichlorobenzene or chlorobenzene, and may be used in an amountof preferably 0.1 to 3 parts by weight, more preferably 0.2 to 2 partsby weight with respect to 1 part by weight of the diarylamine compoundsrepresented by formula (X-X).

The reaction product is then processed and purified similarly to thecase where the compound represented by formula (X-XI) is a dihalogenatedcompound.

The thiophene-containing compound according to as aspect of theinvention can also be prepared by preparing a triarylamine compoundrepresented by the following formula (X-XII) containing a thiophene ringin a coupling reaction in the presence of a copper catalyst similarly tothe reaction above, and converting the compound into the halogenatedcompound (X-XIII) by halogenation of the thiophene ring withN-bromosuccimide (NBS), N-chlorosuccimide (NCS), or the like, and thensubjecting the halogenated compound (X-XIII) to a homo-coupling reactionin the presence of a nickel catalyst.

[In formula (X-XII), Ar₁ has the same definition as Ar₁ in formula (X-1)or (X-III), and exemplary range thereof may be also the same; and X′represents a substituted or unsubstituted bivalent aromatic groupcontaining one or plural thiophene rings; and R₉ represents a hydrogenatom, an alkyl group, a substituted or unsubstituted aryl group, or asubstituted or unsubstituted aralkyl group].

[In formula (X-XIII), Ar₁, X′, and R₉ have the same definitions as Ar₁,X′, and R₉ in formula (X-XII), and exemplary ranges thereof may be alsothe same; and G′ represents a bromine or chlorine atom].

The homo-coupling reaction is carried out in combination of ahalogenated compound represented by formula (X-XIII), a nickel complex,triphenylphosphine, and zinc in a solvent. When the halogen atom to beintroduced is a chlorine atom, the halogen atom may be introduced byhalogenation before the triarylamine skeleton is formed in couplingreaction using a copper catalyst.

Examples of the nickel complex for use in an aspect of the inventioninclude nickel chloride, nickel bromide, and nickel acetate, and thenickel complex may be used in an amount of preferably 0.001 to 3equivalents, more preferably 0.1 to 2 equivalents, with respect to 1equivalent of the compound (X-XIII). In addition, a reducing agent suchas zinc may be present in the reaction system, and may be used in anamount of preferably 0.001 to 3 equivalents, more preferably 0.1 to 2equivalents, with respect to 1 equivalent of the compound represented byformula (X-XIII). Triphenylphosphine may be used in an amount of 0.5 to3 equivalents, preferably 0.7 to 2 equivalents, with respect to 1equivalent of the compound (X-XIII).

Examples of the solvent for use in the reaction includedimethylformamide (DMF), dimethylacetamide (DMA), tetrahydrofuran (THF),dimethoxyethane (DME), and N-methylpyrrolidone (NMP), and the solventmay be used in an amount of preferably 0.1 to 10 equivalents, morepreferably 2 to 5 equivalents, with respect to 1 equivalent of thecompounds above. The reaction may be carried out under an inert gasatmosphere such as of nitrogen or argon at a temperature of 0 to 100°C., preferably in a temperature range from room temperature to 50° C.,while the solution is stirred sufficiently and efficiently.

After termination of the reaction, the reaction solution is poured intowater and the mixture is stirred thoroughly, and, when the reactionproduct is crystalline, a crude product is collected by suctionfiltration. When the reaction product is oily, a crude product can beobtained by extraction with a suitable solvent such as ethyl acetate ortoluene. The crude product thus obtained is purified by being subjectedto column chromatography with silica gel, alumina, activated clay,activated carbon, or the like, or by adding such an adsorbent into thesolution and adsorbing undesirable components. When the reaction productis crystalline, it is further purified by recrystallization using asuitable solvent such as hexane, methanol, acetone, ethanol, ethylacetate, or toluene.

The polymer according to an aspect of the invention represented byformulae (X-II-1) and (X-II-2) can be prepared from a monomerrepresented by the following formula (X-XIV) by polymerization accordingto a known method described, for example, in New Experimental Chemistry4th Ed., 28 (the Chemical Society of Japan Ed., Maruzen).

In formula (X-XIV), n, Ar₁, and R₁ to R₃ have the same definitions as n,Ar₁, and R₁ to R₃ in formula (X-1) above, respectively, and exemplaryranges thereof may be also the same. A′ represents a hydroxyl group, ahalogen atom, or —O—R₁₀ (R₁₀ represents an alkyl group, a substituted orunsubstituted aryl group or an aralkyl group. Specifically, thethiophene-containing compound polymers represented by formulae (X-II-1)and (X-II-2) can be prepared in the following manner:

<1> When A′ is Hydroxyl Group

When A′ is a hydroxyl group, a dihydric alcohol represented byHO—(Y—O)_(m)—H is mixed substantially in the equivalent amount, andpolymerization is allowed to proceed in the presence of an acidcatalyst. An acid commonly used for esterification such as sulfuricacid, toluenesulfonic acid, or trifluoroacetic acid can be used as theacid catalyst, and it may be used in an amount in the range ofpreferably 1/10,000 to 1/10 part by weight, more preferably 1/1,000 to1/50 part by weight, with respect to 1 part by weight of the monomer.Use of a solvent that is azeotropic with water may be used to removewater generated during preparation, and use of toluene, chlorobenzene,1-chloronaphthalene, or the like, is effective. The solvent that isazeotropic with water may be used in an amount in the range ofpreferably 1 to 100 parts by weight, more preferably 2 to 50 parts byweight, with respect to 1 part by weight of the monomer. Y and m havethe same definitions as Y and m described above, respectively, andexemplary ranges thereof may be also the same.

The reaction temperature is arbitrarily set, and the reaction may becarried out at the boiling point of the solvent so as to remove watergenerated during polymerization. When no solvent is used, the resultantpolymer is dissolved in a solvent that is capable of dissolving thepolymer after reaction. When a solvent is used, the polymer isprecipitated by adding dropwise the reaction solution as it is into apoor solvent such as an alcohol (e.g., methanol or ethanol) or acetone.Then, the polymer is separated, washed thoroughly with water and/or anorganic solvent, and dried. Further, if needed, the polymer may bereprecipitated repeatedly by dissolving the polymer in a suitableorganic solvent and then adding the solution into a poor solventdropwise to precipitate the polymer. During the reprecipitationprocessing, it is preferable to stir the solution sufficiently andefficiently with a mechanical stirrer or the like. The amount of thesolvent to be used for dissolving the polymer during the reprecipitationis in the range of preferably 1 to 100 parts by weight, more preferably2 to 50 parts, with respect to 1 part by weight of the polymer. Theamount of the poor solvent to be used is in the range of preferably 1 to1,000 parts by weight, more preferably 10 to 500 parts by weight, withrespect to 1 part by weight of the polymer.

[2] When A′ is Halogen

When A′ is a halogen, a dihydric alcohol represented by HO—(Y—O)_(m)—His mixed substantially in the equivalent amount, and polymerization isallowed to proceed in the presence of an organic base catalyst such aspyridine or triethylamine. The organic base catalyst may be used in anamount in the range of 1 to 10 parts by weight, preferably 2 to 5 partsby weight, with respect to 1 part by weight of the monomer. Effectivesolvents include methylene chloride, tetrahydrofuran (THF), toluene,chlorobenzene, 1-chloronaphthalene, and the like, and the solvent may beused in an amount in the range of 1 to 100 parts by weight, preferably 2to 50 parts by weight, with respect to 1 part by weight of the monomer.The reaction temperature may be arbitrarily set. The polymer afterpolymerization may be purified by reprecipitation as described above. Yand m have the same definitions as Y and m described above,respectively, and exemplary ranges thereof may be also the same.

An interfacial polymerization method may be used when a dihydric alcoholhaving higher acidity such as bisphenol is used. Specifically, afterwater is added to a dihydric alcohol and an equivalent amount of a baseis added to and dissolved in the mixture, a monomer solution containingthe monomer in the equivalent amount to the dihydric alcohol is thenadded thereto while the mixture is stirred vigorously, whereby thepolymerization occurs. The amount of water used then is in the range of1 to 1,000 parts by weight, preferably 2 to 500 parts by weight, withrespect to 1 part by weight of the dihydric alcohol. Examples ofsolvents effective in dissolving the monomer include methylene chloride,dichloroethane, trichloroethane, toluene, chlorobenzene, and1-chloronaphthalene. The reaction temperature may be set arbitrarily,and use of a phase-transfer catalyst such as an ammonium salt or asulfonium salt is effective for acceleration of the reaction. Thephase-transfer catalyst may be used in an amount in the range of 0.1 to10 parts by weight, preferably 0.2 to 5 parts by weight, with respect to1 part by weight of the monomer.

[3] When A′ is —O—R₁₀

When A′ is —O—R₁₀, a polymer can be obtained in ester exchange reactionin which an excessive amount of dihydric alcohol represented byHO—(Y—O)_(m)—H is added, and the reaction mixture is heated in thepresence of a catalyst such as an inorganic acid (e.g., sulfuric acid orphosphoric acid), titanium alkoxide, an acetate or carbonate salt ofcalcium and cobalt, or an oxide of zinc. The dihydric alcohol is used inan amount in the range of 2 to 100 equivalents, preferably 3 to 50equivalents, with respect to 1 equivalent of the monomer. The catalystmay be used in an amount in the range of 1/1,000 to 1 parts by weight,preferably 1/100 to ½ parts by weight, with respect to 1 part by weightof the monomer. The reaction may be carried out at a reactiontemperature of 200 to 300° C., and, after completion of ester exchangefrom the group —O—R₁₀ to the group HO—(Y—O)_(m)—H, the reaction may becarried out under reduced pressure so as to accelerate thepolymerization reaction through elimination of the group HO—(Y—O)_(m)—H.Y and m have the same definitions as Y and m described above,respectively, and exemplary ranges thereof may be also the same.

In an exemplary embodiment, the reaction is carried out under a reducedpressure by using a high-boiling solvent azeotropic with the groupHO—(Y—O)_(m)—H, such as 1-chloronaphthalene, while the groupHO—(Y—O)_(m)—H is removed by azeotropic distillation.

On the other hand, the thiophene-containing compound polymer representedby formula (X-II-2) can be prepared in the following manner: In each ofthe cases described above, the compound represented by the followingformula (X-XV) is formed by allowing the reaction to proceed in thepresence of an excess dihydric alcohol, and the desired polymer can beobtained by allowing the compound represented by formula (X-XV) as themonomer to react with a bivalent carboxylic acid, a bivalent carboxylichalide, or the like.

In formula (X-XV), Ar₁, X, R₁ to R₃, and n have the same definitions asAr₁, X, R₁ to R₃, and n in formula (X-1) above, respectively, andexemplary ranges thereof may be also the same. Y represents ahydrocarbon group.

The thiophene-containing compound and the thiophene-containing compoundpolymer according to an aspect of the invention are compounds superiorin electric charge-transporting efficiency, solubility, andfilm-formability, and also higher in charge-transporting efficiency andlight-emitting efficiency. In addition, the thiophene-containingcompound according to an aspect of the invention and the polymer thereofare easy to prepare and to control the physical properties thereof suchas ionization potential (IP) and glass transition temperature (Tg) byintroduction of substituents, and thus, are very useful as a materialfor use in organic electronic devices such as organic photoreceptors,organic electroluminescent devices, and organic transistors.

The organic electroluminescent device according to one aspect of thepresent invention is an electroluminescent device including a pair ofelectrodes, at least one of which being a transparent or semitransparentelectrode, and one or more organic compound layers provided between theelectrodes. At least one of the organic compound layers includes acharge-transporting polyester having a repeating structure containing atleast one structure selected from the structures represented by thefollowing formulae (I-1) and (I-2) as its partial structure.

[In formulae (I-1) and (I-2), Ar represents a substituted orunsubstituted monovalent phenyl group, a substituted or unsubstitutedmonovalent polynuclear aromatic hydrocarbon having 2 to 10 aromaticrings, a substituted or unsubstituted a monovalent fused aromatichydrocarbon having 2 to 10 aromatic rings, or a substituted orunsubstituted monovalent aromatic heterocyclic ring; X represents agroup represented by the following formula (II); T represents a bivalentstraight-chain hydrocarbon group having 1 to 6 carbon atoms or abivalent branched hydrocarbon group having 2 to 10 carbon atoms; and kand l each independently represent an integer of 0 or 1]:

[In formula (II), R¹ and R² each independently represent a hydrogenatom, a substituted or unsubstituted alkyl group, a substituted orunsubstituted aryl group, or a substituted or unsubstituted aralkylgroup; and n is an integer of 1 to 10].

The organic electroluminescent device according to the aspect of theinvention having at least one organic compound layer containing acharge-transporting polyester shows sufficient luminance and is superiorin stability and durability. It also allows expansion in size and iseasy to produce. It is also possible to provide the charge-transportingpolyester with hole-transporting ability and/or electron-transportingability by selecting the structure described below appropriately, andthus, the charge-transporting polyester can be used in any of the layerssuch as a hole transport layer, a light-emitting layer, or an electrontransport layer in accordance with the purpose.

Hereinafter, as the beginning of detailed description of aspects of theinvention, the charge-transporting polyester according to the aspect ofthe invention will be described first in detail.

—Charge-Transporting Polyester—

In formulae (I-1) and (I-2), Ar represents a substituted orunsubstituted monovalent phenyl group, a substituted or unsubstitutedmonovalent polynuclear aromatic hydrocarbon having 2 to 10 aromaticrings, a substituted or unsubstituted monovalent fused aromatichydrocarbon having 2 to 10 aromatic rings, or a substituted orunsubstituted monovalent aromatic heterocyclic ring. The two Ar groupspresent in each of formula (I-1) and (I-2) may be the same as ordifferent from each other, but are preferably the same from theviewpoint of productivity.

In formulae (I-1) and (I-2), the number of aromatic rings constitutingthe polynuclear aromatic hydrocarbon or the fused aromatic hydrocarbonselected as the structure represented by Ar is more preferably 2 to 5,and the fused aromatic hydrocarbon is preferably an aromatic hydrocarbonin which all aromatic rings are fused.

In formulae (I-1) and (I-2), the aromatic heterocyclic ring selected asthe structure represented by Ar is an aromatic ring containing elementsother than carbon and hydrogen. The number of the atoms constituting thering skeleton (Nr) may be, for example, 5 or 6. The kind and number ofthe atoms other than carbon (hetero atoms) in the ring skeleton are notparticularly limited, but, for example, a sulfur atom, a nitrogen atom,an oxygen atom, or the like may be used. Two or more kinds of heteroatoms may be contained in the ring skeleton. Two or more hetero atomsmay be contained in the ring skeleton. Examples of the heterocyclic ringhaving a five-membered ring structure include thiophene, thiofin,pyrrole, furan, and a heterocyclic ring obtained by substituting thecarbons at the 3- and 4-positions of any of the above heterocyclic ringswith nitrogens, and examples of the heterocyclic rings having asix-membered ring structure include a pyridine ring.

Although the ring may be entirely or partially conjugated, it ispreferably an entirely conjugated system from the points ofcharge-transporting efficiency and luminous efficiency.

Examples of a substituent on a group represented by Ar in formulae (I-1)and (I-2) include a hydrogen atom, alkyl groups, alkoxy groups, phenoxygroups, aryl groups, aralkyl groups, substituted amino groups, andhalogen atoms. The alkyl group may be a group having 1 to 10 carbonatoms, and examples thereof include a methyl group, an ethyl group, apropyl group, and an isopropyl group. The alkoxy group may be a grouphaving 1 to 10 carbon atoms, and examples thereof include a methoxygroup, an ethoxy group, a propoxy group, and an isopropoxy group. Thearyl group may be a group having 6 to 20 carbon atoms, and examplesthereof include a phenyl group and a toluoyl group. The aralkyl groupmay be a group having 7 to 20 carbon atoms, and examples thereof includea benzyl group and a phenethyl group. Examples of a substituentcontained in the substituted amino group include alkyl groups, arylgroups, and aralkyl groups, and specific examples thereof are the sameas those described above.

In formulae (I-1) and (I-2), X represents a bivalent aromatic grouprepresented by formula (II) above.

In formula (II), the alkyl group selected as the structure representedby R¹ or R² may be a group having 1 to 10 carbon atoms, and examplesthereof include a methyl group, an ethyl group, a propyl group, and anisopropyl group. The aryl group may be a group having 6 to 20 carbonatoms, and examples thereof include a phenyl group and a toluoyl group.The aralkyl group may be a group having 7 to 20 carbon atoms, andexamples thereof include a benzyl group and a phenethyl group.

In formula (II), when there is a substituent on the group represented byR¹ or R², the substituent may be selected from those described above assubstituents that can be substituted on a group represented by Ar informulae (I-1) and (I-2).

Multiple groups R¹s or R²s present in formula (II) may be the same as ordifferent from each other.

In formulae (I-1) and (I-2), T represents a bivalent straight-chainhydrocarbon group having 1 to 6 carbon atoms or a bivalent branchedhydrocarbon group having 2 to 10 carbon atoms, and is preferablyselected from bivalent straight-chain hydrocarbon groups having 2 to 6carbon atoms and bivalent branched hydrocarbon groups having 3 to 7carbon atoms. More specifically among them, the bivalent hydrocarbongroups shown below are more preferable.

In each of formulae (I-1) and (I-2), the numbers, 1s, for the two-(T)₁-groups flanking the aromatic diamine skeleton may be the same asor different from each other, and two or more groups Ts flanking thearomatic diamine skeleton may be the same as or different from eachother. However, a structure in which the numbers is are the same and thekinds of Ts are the same is preferable from the viewpoint ofproductivity.

Specific examples of the structure represented by formula (I-1) aboveare shown below. In the Tables, “Bond Pos.” refers to the bond position.

TABLE 7 Structure X 1

2

3

4

5

6

Structure Ar T k I Bond Pos. 1

— 1 0 3 2

— 1 0 3 3

— 1 0 4 4

— 1 0 4 5

— 1 0 4 6

—CH₂— 1 1 3

TABLE 8 Structure X 7

8

9

10

11

12

Structure Ar T k I Bond Pos. 7

—CH₂CH₂— 1 1 3 8

—CH₂CH₂— 1 1 3 9

—CH₂— 1 1 4 10

—CH₂CH₂— 1 1 4 11

1 1 4 12

—CH₂— 0 1 3

TABLE 9 Structure X 13

14

15

16

17

18

Structure Ar T k I Bond Pos. 13

—CH₂CH₂— 0 1 3 14

—CH₂CH₂— 0 1 3 15

—CH₂— 0 1 4 16

—CH₂— 0 1 4 17

0 1 4 18

0 1 4

TABLE 10 Structure X 19

20

21

22

23

24

Structure Ar T k l Bond Pos. 19

—CH₂— 0 1 4 20

—CH₂CH₂— 0 1 4 21

—CH₂CH₂— 0 1 4 22

—CH₂CH₂— 0 1 4 23

—CH₂CH₂— 0 1 4 24

—CH₂CH₂— 0 1 4

TABLE 11 Structure X 25

26

27

28

29

30

Structure Ar T k l Bond Pos. 25

—CH₂CH₂— 0 1 4 26

—CH₂— 0 1 4 27

—CH₂CH₂— 0 1 4 28

—CH₂— 0 1 4 29

—CH₂CH₂— 0 1 4 30

—CH₂CH₂— 0 1 4

TABLE 12 Structure X 31

32

33

34

35

36

Structure Ar T k l Bond Pos. 31

—CH₂CH₂— 0 1 4 32

—CH₂CH₂— 0 1 4 33

—CH₂CH₂— 0 1 4 34

—CH₂— 0 1 4 35

0 1 4 36

0 1 4

TABLE 13 Structure X 37

38

39

40

41

42

Structure Ar T k l Bond Pos. 37

—CH₂CH₂— 0 1 4 38

0 1 3 39

0 1 4 40

—CH₂CH₂— 0 1 4 41

—CH₂CH₂— 0 1 4 42

—CH₂CH₂— 0 1 4

TABLE 14 Structure X 43

44

45

46

47

48

Structure Ar T k l Bond Pos. 43

—CH₂CH₂— 0 1 4 44

—CH₂CH₂— 0 1 4 45

—CH₂— 0 1 4 46

—CH₂CH₂— 0 1 4 47

—CH₂— 0 1 4 48

—CH₂— 0 1 3

TABLE 15 Structure X 49

50

51

52

53

Structure Ar T k l Bond Pos. 49

—CH₂CH₂— 0 1 4 50

—CH₂CH₂— 0 1 4 51

0 1 4 52

—CH₂CH₂— 0 1 4 53

—CH₂— 0 1 4

TABLE 16 Structure X 54

55

56

57

58

Structure Ar T k l Bond Pos. 54

—CH₂CH₂— 0 1 3 55

—CH₂CH₂— 0 1 4 56

—CH₂CH₂— 0 1 2 57

—CH₂— 0 1 3 58

—CH₂CH₂— 0 1 4

TABLE 17 Structure X 59

60

61

62

63

Structure Ar T k l Bond Pos. 59

—CH₂CH₂— 0 1 4 60

—CH₂CH₂— 0 1 3 61

—CH₂— 0 1 4 62

—CH₂— 0 1 4 63

—CH₂CH₂— 0 1 4

TABLE 18 Structure X 64

65

66

67

68

Structure Ar T k l Bond Pos. 64

—CH₂CH₂— 0 1 4 65

—CH₂— 0 1 4 66

—CH₂— 0 1 4 67

—CH₂CH₂— 0 1 4 68

0 1 4

TABLE 19 Structure X 69

70

71

72

73

Structure Ar T k l Bond Pos. 69

—CH₂— 0 1 4 70

—CH₂CH₂— 0 1 4 71

—CH₂CH₂— 0 1 4 72

—CH₂CH₂— 0 1 4 73

—CH₂CH₂— 0 1 4

TABLE 20 Structure X 74

75

76

77

78

Structure Ar T k l Bond Pos. 74

—CH₂CH₂— 0 1 3 75

—CH₂CH₂— 0 1 4 76

0 1 4 77

—CH₂CH₂— 0 1 4 78

—CH₂CH₂— 0 1 4

TABLE 21 Structure X 79

80

81

82

83

84

Structure Ar T k l Bond Pos. 79

—CH₂CH₂— 0 1 3 80

—CH₂— 0 1 4 81

—CH₂CH₂— 0 1 4 82

—CH₂— 0 1 4 83

—CH₂CH₂— 0 1 4 84

—CH₂CH₂— 0 1 4

TABLE 22 Structure X 85

86

87

88

89

90

91

Structure Ar T k l Bond Pos. 85

—CH₂CH₂— 0 1 4 86

—CH₂CH₂— 0 1 4 87

—CH₂CH₂— 0 1 4 88

—CH₂— 0 1 4 89

—CH₂CH₂— 0 1 4 90

—CH₂CH₂— 0 1 3 91

—CH₂— 0 1 4

TABLE 23 Structure X 92

93

94

95

96

97

Structure Ar T k l Bond Pos. 92

—CH₂CH₂— 0 1 4 93

—CH₂CH₂— 0 1 4 94

—CH₂CH₂— 0 1 4 95

—CH₂CH₂— 0 1 4 96

—CH₂CH₂— 0 1 4 97

—CH₂CH₂— 0 1 4

TABLE 24 Structure X  98

 99

100

101

102

103

Structure Ar T k l Bond Pos.  98

—CH₂— 0 1 3  99

—CH₂CH₂— 0 1 4 100

—CH₂CH₂— 0 1 4 101

—CH₂CH₂— 0 1 4 102

—CH₂CH₂— 0 1 4 103

—CH₂CH₂— 0 1 4

TABLE 25 Structure X 104

105

106

107

108

109

Structure Ar T k l Bond Pos. 104

—CH₂CH₂— 0 1 4 105

—CH₂CH₂— 0 1 4 106

—CH₂CH₂— 0 1 4 107

—CH₂CH₂— 0 1 4 108

—CH₂— 0 1 4 109

—CH₂CH₂— 0 1 4

TABLE 26 Structure X 110

111

112

113

114

115

Structure Ar T k l Bond Pos. 110

—CH₂— 0 1 4 111

—CH₂— 0 1 4 112

—CH₂CH₂— 0 1 4 113

—CH₂CH₂— 0 1 2 114

—CH₂CH₂— 0 1 3 115

—CH₂— 0 1 4

TABLE 27 Structure X 116

117

118

119

120

121

Structure Ar T k l Bond Pos. 116

—CH₂CH₂— 0 1 4 117

0 1 4 118

0 1 4 119

—CH₂CH₂— 0 1 4 120

—CH₂— 0 1 4 121

—CH₂CH₂— 0 1 3

TABLE 28 Structure X 122

123

124

125

126

Structure Ar T k l Bond Pos. 122

—CH₂CH₂— 0 1 4 123

—CH₂CH₂— 0 1 4 124

0 1 4 125

0 1 4 126

—CH₂CH₂— 0 1 4

TABLE 29 Structure X 127

128

129

130

131

Structure Ar T k l Bond Pos. 127

0 1 4 128

—CH₂CH₂— 0 1 4 129

—CH₂CH₂— 0 1 4 130

—CH₂CH₂— 0 1 4 131

—CH₂CH₂— 0 1 4

TABLE 30 Structure X 132

133

134

135

136

Structure Ar T k l Bond Pos. 132

—CH₂— 0 1 4 133

—CH₂CH₂— 0 1 4 134

—CH₂CH₂— 0 1 4 135

0 1 3 136

—CH₂CH₂— 0 1 4

TABLE 31 Structure X 137

138

139

140

141

Structure Ar T k l Bond Pos. 137

—CH₂CH₂— 0 1 4 138

—CH₂CH₂— 0 1 4 139

—CH₂CH₂— 0 1 4 140

—CH₂— 0 1 4 141

—CH₂CH₂— 0 1 4

TABLE 32 Structure X 142

143

144

145

Structure Ar T k Bond Pos. 142

—CH₂CH₂— 0 1 4 143

—CH₂CH₂— 0 1 4 144

—CH₂CH₂— 0 1 4 145

—CH₂CH₂— 0 1 4

TABLE 33 Structure X 146

147

148

149

Structure Ar T k l Bond Pos. 146

—CH₂CH₂— 0 1 4 147

—CH₂CH₂— 0 1 4 148

—CH₂CH₂— 0 1 4 149

—CH₂CH₂— 0 1 4

TABLE 34 Structure X 150

151

152

153

154

155

Structure Ar T k l Bond Pos. 150

—CH₂CH₂— 0 1 4 151

—CH₂CH₂— 0 1 4 152

—CH₂CH₂— 0 1 4 153

—CH₂CH₂— 0 1 4 154

—CH₂CH₂— 0 1 4 155

—CH₂CH₂— 0 1 4

TABLE 35 Structure X 156

157

158

159

160

161

Structure Ar T k l Bond Pos. 156

—CH₂CH₂— 0 1 4 157

—CH₂CH₂— 0 1 4 158

—CH₂CH₂— 0 1 4 159

—CH₂CH₂— 0 1 4 160

—CH₂CH₂— 0 1 4 161

—CH₂CH₂— 0 1 4

TABLE 36 Structure X 162

163

164

165

166

167

Structure Ar T k l Bond Pos. 162

—CH₂CH₂— 0 1 4 163

—CH₂CH₂— 0 1 4 164

—CH₂CH₂— 0 1 4 165

—CH₂CH₂— 0 1 4 166

—CH₂CH₂— 0 1 4 167

—CH₂— 0 1 4

TABLE 37 Structure X 168

Structure Ar T k l Bond Pos. 168

—CH₂CH₂— 0 1 4

Specific examples of the structure represented by formula (I-2) aboveare shown below.

TABLE 38 Structure X 200

201

202

203

204

205

Structure Ar T k l Bond Pos. 200

— 1 0 3.3′ 201

— 1 0 3.3′ 202

— 1 0 3.3′ 203

— 1 0 3.3′ 204

— 1 0 4.4′ 205

— 1 0 4.4′

TABLE 39 Structure X 206

207

208

209

210

Structure Ar T k l Bond Pos. 206

— 1 0 4.4′ 207

— 1 0 4.4′ 208

— 1 0 4.4′ 209

— 1 0 4.4′ 210

—CH₂— 0 1 4.4′

TABLE 40 Struc- Bond ture X Ar T k l Pos. 211

—CH₂CH₂— 0 1 4.4′ 212

—CH₂CH₂— 0 1 4.4′ 213

—CH₂CH₂— 0 1 4.4′ 214

—CH₂— 0 1 2.2′ 215

—CH₂CH₂— 0 1 3.3′ 216

—CH₂CH₂— 0 1 4.4′

TABLE 41 Struc- Bond ture X Ar T k l Pos. 217

—CH₂CH₂— 0 1 4.4′ 218

0 1 4.4′ 219

—CH₂CH₂— 0 1 3.3′ 220

—CH₂CH₂— 0 1 4.4′ 221

0 1 4.4′ 222

—CH₂CH₂— 0 1 4.4′

TABLE 42 Struc- Bond ture X Ar T k l Pos. 223

—CH₂CH₂— 0 1 4.4′ 224

0 1 4.4′ 225

—CH₂— 0 1 4.4′ 226

—CH₂CH₂— 0 1 4.4′ 227

—CH₂CH₂— 0 1 4.4′ 228

—CH₂— 0 1 4.4′

TABLE 43 Struc- Bond ture X Ar T k l Pos. 229

—CH₂CH₂— 0 1 4.4′ 230

—CH₂— 0 1 4.4′ 231

—CH₂CH₂— 0 1 4.4′ 232

0 1 4.4′ 233

—CH₂CH₂— 0 1 4.4′ 234

—CH₂CH₂— 0 1 4.4′

TABLE 44 Struc- Bond ture X Ar T k l Pos. 235

—CH₂— 0 1 4.4′ 236

—CH₂CH₂— 0 1 3.3′ 237

—CH₂CH₂— 0 1 4.4′ 238

—CH₂CH₂— 0 1 4.4′ 239

—CH₂CH₂— 0 1 4.4′ 240

—CH₂CH₂— 0 1 4.4′

TABLE 45 Struc- Bond ture X Ar T k l Pos. 241

—CH₂— 0 1 4.4′ 242

—CH₂CH₂— 0 1 4.4′ 243

—CH₂CH₂— 0 1 4.4′ 244

—CH₂CH₂— 0 1 4.4′ 245

—CH₂— 0 1 3.3′ 246

—CH₂CH₂— 0 1 4.4′

TABLE 46 Struc- Bond ture X Ar T k l Pos. 247

—CH₂CH₂— 0 1 4.4′ 248

—CH₂CH₂— 0 1 4.4′ 249

—CH₂CH₂— 0 1 4.4′ 250

—CH₂CH₂— 0 1 3.3′ 251

—CH₂CH₂— 0 1 3.3′ 252

—CH₂CH₂— 0 1 4.4′

TABLE 47 Struc- Bond ture X Ar T k l Pos. 253

—CH₂CH₂— 0 1 3.3′ 254

—CH₂CH₂— 0 1 3.3′ 255

—CH₂CH₂— 0 1 3.3′ 256

—CH₂CH₂— 0 1 3.3′

TABLE 48 Struc- Bond ture X Ar T k l Pos. 257

—CH₂CH₂— 0 1 4.4′ 258

—CH₂CH₂— 0 1 4.4′ 259

—CH₂CH₂— 0 1 4.4′ 260

—CH₂CH₂— 0 1 4.4′

TABLE 49 Struc- Bond ture X Ar T k l Pos. 261

—CH₂— 0 1 4.4′ 262

—CH₂CH₂— 1 1 4.4′ 263

—CH₂CH₂— 0 1 4.4′ 264

—CH₂CH₂— 0 1 4.4′ 265

—CH₂CH₂— 0 1 4.4′ 266

—CH₂— 0 1 4.4′

TABLE 50 Struc- ture X Ar T k l Pos. 267

—CH₂— 0 1 4.4′ 268

—CH₂CH₂— 0 1 4.4′ 269

0 1 4.4′ 270

—CH₂CH₂— 0 1 4.4′ 271

0 1 4.4′

TABLE 51 Struc- Bond ture X Ar T k l Pos. 272

0 1 4.4′ 273

—CH₂CH₂— 0 1 4.4′ 274

0 1 4.4′ 275

—CH₂CH₂— 0 1 4.4′ 276

0 1 4.4′

TABLE 52 Struc- Bond ture X Ar T k l Pos. 277

—CH₂CH₂— 0 1 4.4′ 278

0 1 4.4′ 279

—CH₂CH₂— 0 1 4.4′ 280

0 1 4.4′ 281

—CH₂CH₂— 0 1 4.4′

TABLE 53 Struc- Bond ture X Ar T k l Pos. 282

—CH₂CH₂— 0 1 4.4′ 283

—CH₂CH₂— 0 1 4.4′ 284

—CH₂CH₂— 0 1 4.4′ 285

—CH₂CH₂— 0 1 4.4′ 286

—CH₂CH₂— 0 1 4.4′ 287

—CH₂CH₂— 0 1 4.4′

TABLE 54 Struc- Bond ture X Ar T k l Pos. 288

—CH₂CH₂— 0 1 4.4′ 289

—CH₂— 0 1 4.4′ 290

—CH₂CH₂— 0 1 4.4′ 291

—CH₂CH₂— 0 1 4.4′ 292

—CH₂CH₂— 0 1 4.4′ 293

—CH₂CH₂— 0 1 4.4′

TABLE 55 Structure X 294

295

296

297

298

299

Bond Structure Ar T k l Pos. 294

—CH₂CH₂— 0 1 4.4′ 295

—CH₂CH₂— 0 1 4.4′ 296

0 1 4.4′ 297

—CH₂— 0 1 4.4′ 298

0 1 4.4′ 299

—CH₂CH₂— 0 1 3.3′

TABLE 56 Structure X 300

301

302

303

304

305

Bond Structure Ar T k l Pos. 300

—CH₂CH₂— 0 1 4.4′ 301

—CH₂CH₂— 0 1 3.3′ 302

—CH₂CH₂— 0 1 4.4′ 303

—CH₂— 0 1 4.4′ 304

—CH₂CH₂— 0 1 4.4′ 305

—CH₂CH₂— 0 1 4.4′

TABLE 57 Structure X 306

307

308

309

310

311

312

Bond Structure Ar T k l Pos. 306

—CH₂CH₂— 0 1 4.4′ 307

—CH₂— 0 1 4.4′ 308

—CH₂CH₂— 0 1 4.4′ 309

—CH₂CH₂— 0 1 4.4′ 310

—CH₂— 0 1 4.4′ 311

—CH₂CH₂— 0 1 4,4′ 312

—CH₂— 0 1 4.4′

TABLE 58 Structure X 313

314

315

316

317

Bond Structure Ar T k l Pos. 313

—CH₂CH₂— 0 1 4.4′ 314

—CH₂CH₂— 0 1 4.4′ 315

—CH₂CH₂— 0 1 4.4′ 316

—CH₂CH₂— 0 1 4.4′ 317

—CH₂CH₂— 0 1 4.4′

TABLE 59 Structure X 318

319

320

321

322

323

Bond Structure Ar T k l Pos. 318

—CH₂CH₂— 0 1 4.4′ 319

—CH₂CH₂— 0 1 4.4′ 320

—CH₂CH₂— 0 1 4.4′ 321

—CH₂CH₂— 0 1 4.4′ 322

—CH₂CH₂— 0 1 4.4′ 323

—CH₂CH₂— 0 1 4.4′

TABLE 60 Structure X 324

325

326

327

328

329

330

Bond Structure Ar T k l Pos. 324

—CH₂CH₂— 0 1 4.4′ 325

—CH₂CH₂— 0 1 4.4′ 326

—CH₂CH₂— 0 1 4.4′ 327

—CH₂CH₂— 0 1 4.4′ 328

—CH₂CH₂— 0 1 4.4′ 329

—CH₂— 0 1 4.4′ 330

0 1 4.4′

TABLE 61 Structure X 331

332

333

334

335

336

Bond Structure Ar T k l Pos. 331

—CH₂CH₂— 0 1 4.4′ 332

—CH₂— 0 1 4.4′ 333

—CH₂CH₂— 0 1 4.4′ 334

—CH₂CH₂— 0 1 4.4′ 335

0 1 4.4′ 336

—CH₂— 0 1 4.4′

TABLE 62 Structure X 337

338

339

340

Bond Structure Ar T k l Pos. 337

—CH₂— 0 1 4.4′ 338

—CH₂CH₂— 0 1 4.4′ 339

—CH₂CH₂— 0 1 4.4′ 340

0 1 4.4′

TABLE 63 Structure X 341

342

343

345

Bond Structure Ar T k l Pos. 341

—CH₂CH₂— 0 1 4.4′ 342

—CH₂CH₂— 0 1 4.4′ 343

—CH₂CH₂— 0 1 4.4′ 345

—CH₂CH₂— 0 1 4.4′

TABLE 64 Structure X 346

347

348

Bond Structure Ar T k l Pos. 346

—CH₂CH₂— 0 1 4.4′ 347

—CH₂CH₂— 0 1 4.4′ 348

—CH₂CH₂— 0 1 4.4′

Examples of charge-transporting polyesters having a repeating structurecontaining at least one structure selected from the structuresrepresented by formulae (I-1) and (I-2) as a partial structure includethe polyesters represented by the following formulae (III-1) and(III-2).

[In formulae (III-1) and (III-2), Y and Z each independently represent abivalent hydrocarbon group; B and B′ each independently represent—O—(Y—O)_(m)—H, or —O—(Y—O)_(m)—CO—Z—CO—OR′; R and R′ each independentlyrepresent a hydrogen atom, a substituted or unsubstituted alkyl group, asubstituted or unsubstituted aryl group, or a substituted orunsubstituted aralkyl group; m is an integer of 1 to 5, p is an integerof 5 to 5,000; and A represents at least one of the structuresrepresented by formulae (I-1) and (I-2) above].

In formulae (III-1) and (III-2), A represents at least one structureselected from the structures represented by formulae (I-1) and (I-2);and multiple groups A present in the polyester represented by formula(III-1) or (III-2) may have the same structure as each other ordifferent structures from each other.

In formulae (III-1) and (III-2), R represents a hydrogen atom, asubstituted or unsubstituted alkyl group, a substituted or unsubstitutedaryl group, or a substituted or unsubstituted aralkyl group. The alkylgroup may be a group having 1 to 10 carbon atoms, and examples thereofinclude a methyl group, an ethyl group, a propyl group, and an isopropylgroup. The aryl group may be a group having 6 to 20 carbon atoms, andexamples thereof include a phenyl group and a toluoyl group. The aralkylgroup may be a group having 7 to 20 carbon atoms, and examples thereofinclude a benzyl group and a phenethyl group.

Examples of a substituent on the group represented by each R include ahydrogen atom, alkyl groups, alkoxy groups, substituted amino groups,and halogen atoms.

In formulae (III-1) and (III-2), Y and Z each independently represent abivalent hydrocarbon group; and, more specifically, Y represents adihydric alcohol residue, and Z represents a bivalent carboxylic acidresidue. Among them, more preferable are groups selected from the groupsrepresented by the following formulae (IV-1) to (IV-7).

[In formulae (IV-1) to (IV-7) above, R¹ and R² each independentlyrepresent a hydrogen atom, a substituted or unsubstituted alkyl grouphaving 1 to 4 carbon atoms, a substituted or unsubstituted alkoxy grouphaving 1 to 4 carbon atoms, a substituted or unsubstituted phenyl group,or a substituted or unsubstituted aralkyl group; each of a and b isindependently an integer of 1 to 5; each of d and f is independently 0or 1; each of c and e is independently an integer of 0 to 2; and Vrepresents a group represented by one of the following formulae (V-1) to(V-11)].

[In formulae (V-1), (V-10) and (V-11) above, g is an integer of 1 to 5,and each of h and i is independently an integer of 0 to 5].

In formulae (III-1) and (III-2), B and B′ each independently represent—O—(Y—O)_(m)—H, or —O—(Y—O)_(m)—CO—Z—CO—OR′. R′ has the same definitionas R described above, and exemplary range thereof may be also the same.

In formulae (III-1) and (III-2), m is an integer of 1 to 5; and p is aninteger of 5 to 5,000, preferably in the range of 10 to 1,000.

Hereinafter, specific examples of the charge-transporting polyestersrepresented by formulae (III-1) and (III-2) will be listed below, butthe invention is not limited by these specific examples. The numbers inthe column for monomer A in the following Tables correspond to thestructure numbers of the specific examples of the structures representedby formula (I-1) and (I-2). The polymers having “-” in column Z arespecific examples of the charge-transporting polyester represented byformula (III-1), and the other polymers are specific examples of thecharge-transporting polyester represented by formula (III-2).

Each specific example of the charge-transporting polyester compound hasan identification number in the following Tables, and a specific examplewith a number, for example, of 15 will be called “charge-transportingpolyester (15)” hereinafter.

TABLE 65 Monomer Polymer A Ratio Y Z m R/B.B′ p  (1) 1 — —CH₂CH₂— — 1 H78  (2) 5 — —CH₂CH₂— — 1 H 59  (3) 5 —

— 1 H 105  (4) 5 — —CH₂CH₂—

1 —OC₂H₄OH 48  (5) 9 —

— 1 H 79  (6) 14 — —CH₂CH₂— — 1 H 80  (7) 15 —

— 1 H 100  (8) 17 — —CH₂CH₂— — 1 H 102  (9) 20 — —CH₂CH₂— — 1 H 98 (10)25 — —CH₂CH₂— — 1 H 83 (11) 25 —

— 1 H 57 (12) 30 — —CH₂CH₂— — 1 H 79 (13) 29 — —CH₂CH₂— — 1 H 97 (14) 29—

— 1 H 124 (15) 29 —

— 1 H 121 (16) 35 —

— 1 H 69 (17) 35 — —CH₂CH₂—

1 —OC₂H₄OH 98 (18) 35 —

— 1 H 60 (19) 29 —

— 1 H 100 (20) 32 — —CH₂CH₂— — 1 H 140 (21) 48 —

— 1 H 123 (22) 49 —

— 1 H 108 (23) 50 —

— 1 H 104 (24) 50 — —CH₂CH₂—

1 —OC₂H₄OH 68 (25) 60 —

— 1 H 59

TABLE 66 Monomer Polymer A Ratio Y Z m R/B.B′ p (26) 66 — —CH₂CH₂— — 1 H96 (27) 70 — —CH₂CH₂— — 1 H 80 (28) 70 —

— 1 H 101 (29) 70 — —CH₂CH₂—

1 —OC₂H₄OH 79 (30) 70 —

— 1 H 96 (31) 73 —

— 1 H 86 (32) 75 — —CH₂CH₂— — 1 H 80 (33) 79 — —CH₂CH₂—

1 —OC₂H₄OH 60 (34) 79 —

— 1 H 95 (35) 81 —

— 1 H 40 (36) 81 —

— 1 H 120 (37) 95 — —CH₂CH₂— — 1 H 107 (38) 95 —

— 1 H 101 (39) 101 —

— 1 H 68 (40) 105 — —CH₂CH₂— — 1 H 70 (41) 115 — —CH₂CH₂—

1 —OC₂H₄OH 89 (42) 116 — —CH₂CH₂— — 1 H 69 (43) 117 —

— 1 H 92 (44) 118 — —CH₂CH₂— — 1 H 85 (45) 119 — —CH₂CH₂— — 1 H 100 (46)120 —

— 1 H 69 (47) 125 — —CH₂CH₂— — 1 H 95 (48) 127 — —CH₂CH₂— — 1 H 98 (49)129 — —CH₂CH₂—

1 —OC₂H₄OH 111

TABLE 67 Monomer Polymer A Ratio Y Z m R/B.B′ p (50) 135 — —CH₂CH₂— — 1H 81 (51) 135 —

— 1 H 88 (52) 141 — —CH₂CH₂— — 1 H 69 (53) 141 —

— 1 H 49 (54) 141 —

— 1 H 49 (55) 144 — —CH₂CH₂— — 1 H 93 (56) 146 —

— 1 H 89 (57) 147 — —CH₂CH₂— — 1 H 101 (58) 147 —

1 —OC₂H₄OH 101 (59) 147 —

— 1 H 101 (60) 149 — —CH₂CH₂— — 1 H 101 (61) 152 — —CH₂CH₂— — 1 H 69(62) 156 —

— 1 H 90 (63) 201 —

— 1 H 95 (64) 206 — —CH₂CH₂—

1 —OC₂H₄OH 65 (65) 208 — —CH₂CH₂— — 1 H 109 (66) 214 — —CH₂CH₂— — 1 H 82(67) 221 —

— 1 H 77 (68) 234 — —CH₂CH₂— — 1 H 85 (69) 234 — —CH₂CH₂—

1 —OC₂H₄OH 98 (70) 255 — —CH₂CH₂— — 1 H 82 (71) 270 — —CH₂CH₂— — 1 H 60(72) 278 — —CH₂CH₂— — 1 H 82 (73) 279 — —CH₂CH₂—

1 —OC₂H₄OH 82 (74) 290 — —CH₂CH₂— — 1 H 82

TABLE 68 Monomer Polymer A Ratio Y Z m R/B.B′ p (75) 339 — —CH₂CH₂— — 1H 72 (76) 23/31 1/1 —CH₂CH₂— — 1 H 66 (77) 23/35 1/1 —CH₂CH₂— — 1 H 90(78) 23/37 1/1 —CH₂CH₂— — 1 H 109 (79) 25/37 1/1 —CH₂CH₂— — 1 H 89 (80)38/56 1/1 —CH₂CH₂— — 1 H 60 (81) 38/58 1/1 —CH₂CH₂— — 1 H 97 (82) 38/601/1

— 1 H 92 (83) 38/88 1/1 —CH₂CH₂— — 1 H 115 (84) 49/60 1/1 —CH₂CH₂— — 1 H101 (85) 49/65 1/1 —CH₂CH₂—

1 —OC₂H₄OH 47 (86) 49/88 1/1

— 1 H 76 (87) 49/88 1/1 —CH₂CH₂— — 1 H 99 (88) 55/90 1/1 —CH₂CH₂— — 1 H111 (89) 55/95 1/1 —CH₂CH₂—

1 —OC₂H₄OH 67 (90) 60/75 1/1

— 1 H 52 (91) 60/86 1/1 —CH₂CH₂— — 1 H 116 (92) 63/88 1/1

— 1 H 86 (93) 63/90 1/1 —CH₂CH₂— — 1 H 120 (94) 63/95 1/1 —CH₂CH₂—

1 —OC₂H₄OH 52 (95) 88/90 1/1 —CH₂CH₂— — 1 H 89 (96) 88/95 1/1 —CH₂CH₂— —1 H 58 (97) 120/130 1/1 —CH₂CH₂— — 1 H 99 (98) 120/155 1/1 —CH₂CH₂— — 1H 95 (99) 120/130 1/1

— 1 H 78

TABLE 69 Monomer Polymer A Ratio Y Z m R/B.B′ p (100) 120/155 1/1—CH₂CH₂—

1 —OC₂H₄OH 81 (101) 128/180 1/1 —CH₂CH₂— — 1 H 80 (102) 128/150 1/1

— 1 H 104 (103) 135/155 1/1

— 1 H 58

The weight-average molecular weight Mw of the charge-transportingpolyester is preferably in the range of 5,000 to 1,000,000, morepreferably in the range of 10,000 to 300,000.

The weight-average molecular weight Mw can be determined by thefollowing method. The weight-average molecular weight Mw can bedetermined by preparing a THF solution of 1.0 wt % charge-transportingpolymer and analyzing the solution by gel permeation chromatography(GPC) in a differential refractometer (RI) while using styrene polymersas the standard sample.

(Method of Preparing Charge-Transporting Polyester)

The charge-transporting polyester represented by formula (III-1) or(III-2) can be prepared, for example, by polymerization of acharge-transporting monomer represented by the following formula (VI-1)or (VI-2) according to a known method such as the method described inNew Experimental Chemistry 4th Ed., No. 28 (the Chemical Society ofJapan Ed., Maruzen, 1992).

[In formulae (VI-1) and (VI-2), Ar, X, T, k, and l respectively have thesame definitions as Ar, X, T, k, l in formulae (I-1) and (I-2); and A′represents a hydroxyl group, a halogen atom, or —O—R (R represents asubstituted or unsubstituted alkyl group, a substituted or unsubstitutedaryl group, or a substituted or unsubstituted aralkyl group)].

The method of preparing the electric charge-transporting monomerrepresented by formula (VI-1) or (VI-2) will be described first. The rawmaterial monomer for the charge-transporting polymer according to anaspect of the invention can prepared, for example, in the followingmanner, but the method is not limited thereto.

An arylamine derivative and a halogenated carboalkoxyalkylbenzene, or anaryl halide and a carboalkoxyaniline derivative, are allowed to reactwith each other to form a diarylamine, and then, the diarylamine isallowed to react with a bis-halogenated aryl.

[In the reaction formula, G and G′ each independently represent aniodine or bromine atom; Ar has the same definition as Ar in formulae(I-1) and (I-2) above; and R¹, R², and n respectively have the samedefinitions as R¹, R², and n in formula (II), and their exemplary rangesmay be also the same; and R has the same definition as R in formulae(VI-1) and (VI-2), and exemplary range thereof may be also the same].

Alternatively, an arylamine derivative or a benzidine derivative isallowed to react with a halogenated carboalkoxyalkylbenzene to give adiarylamine, and the diarylamine obtained is allowed to react with anaryl halide.

[In the reaction formula, G and G′ each independently represent aniodine or bromine atom; Ar has the same definition as Ar in formulae(I-1) and (I-2) above; R¹. R², and n respectively have the samedefinitions as R¹, R², and in formula (II), and exemplary ranges thereofmay be also the same; and R has the same definition as R in formulae(VI-1) and (VI-2), and exemplary range thereof may be also the same].

When n is an even number, a triarylamine compound can be prepared in asimilar manner to the method above, and a diarylamine can be prepared byhomo-coupling thereof, for example, in the presence of a nickelcatalyst.

[In the reaction formula, Ar has the same definition as Ar in formulae(I-1) and (I-2), and exemplary range thereof may be also the same; R¹and R² have the same definitions as R¹ and R² in formula (II), andexemplary ranges thereof may be also the same; and R has the samedefinition as R in formulae (VI-1) and (VI-2), and exemplary rangethereof may be also the same; and n′ is an even integer in the range of1 to 10].

It is possible to prepare charge-transporting polyesters represented byformulae (III-1) and (III-2) above by polymerizing the obtainedcharge-transporting monomers represented by formula (VI-1) and (VI-2)according to a known method. Specifically, the above-described methodsof preparing the thiophene-containing compound polymers represented byformulae (X-II-1) and (X-II-2) may be used.

The charge-transporting polyesters represented by formulae (III-1) and(III-2) can be prepared in the following manner: In all cases among [1]to [3] described in the above methods, the compound represented by thefollowing formula (VII-1) or (VII-2) is formed in reaction in thepresence of excess dihydric alcohol, and the compound is allowed toreact as the monomer, for example, with a bivalent carboxylic acid or abivalent carboxylic halide by a method similar to [2], to give apolymer.

[In formulae (VII-1) and (VII-2), Ar, X, T, l, and k respectively havethe same definitions as Ar, X, T, l, and k in formulae (I-1) and (I-2)above, and exemplary ranges thereof may be also the same; and Y and mrespectively have the same definitions as Y and m in formulae (III-1)and (III-2) above, and exemplary ranges thereof may be also the same].

—Organic Electroluminescent Device—

Hereinafter, the organic electroluminescent device according to anaspect of the invention will be described in detail.

The layer structure of the organic electroluminescent device accordingto the aspect of the invention is not particularly limited if the devicehas a pair of electrodes, at least one of which is transparent orsemitransparent, and one or multiple organic compound layers providedbetween the electrodes, and at least one of the organic compound layerscontains at least one charge-transporting polyester described above.

When the organic electroluminescent device according to the aspect ofthe invention has one organic compound layer, the organic compound layermeans a light-emitting layer having electric charge-transportingability, and the light-emitting layer contains the abovecharge-transporting polyester. On the other hand when there are multipleorganic compound layers (i.e., when the device is afunction-separation-type device in which each layer has a differentfunction), at least one of the layers is a light-emitting layer, and thelight-emitting layer may be a light-emitting layer having electriccharge-transporting ability. Specific examples of the layer structureconsisting of the light-emitting layer or the light-emitting layerhaving electric charge-transporting ability and other layers in such acase include the followings (1) to (3).

(1) Layer structure consisting of a light-emitting layer and an electrontransport layer and/or an electron injection layer.

(2) Layer structure consisting of a hole transport layer and/or a holeinjection layer, a light-emitting layer, and an electron transport layerand/or and electron injection layer.

(3) Layer structure consisting of a hole transport layer and/or a holeinjection layer, and a light-emitting layer.

The other layers than the light-emitting layer and the light-emittinglayer having electric charge-transporting ability in these layerstructures (1) to (3) have a function as a charge transport layer or asa charge injection layer.

In each of the layer structures (1) to (3), one of the layers maycontain the charge-transporting polyester.

In the organic electroluminescent device according to the aspect of theinvention, the light-emitting layer, hole transport layer, holeinjection layer, electron transport layer, or electron injection layermay contain additionally a charge-transporting compound other than thecharge-transporting polyester (hole-transporting material orelectron-transporting material). Details of such a charge-transportingcompound will be described below.

Hereinafter, the invention will be described more in detail withreference to drawings, but the invention is not limited thereto.

FIGS. 9 to 12 are schematic sectional views illustrating the layerstructure of the organic electroluminescent devices according to aspectsof the invention, and FIGS. 9, 10, and 11 show examples in the casewhere there are multiple organic compound layers. FIG. 12 shows anexample in the case where there is one organic compound layer. In FIGS.9 to 12, the same reference character is allocated to members having thesame function.

The organic electroluminescent device shown in FIG. 9 has a transparentinsulator substrate 1, and a transparent electrode 2, a light-emittinglayer 4, an electron transport layer and/or an electron injection layer5, and a back electrode 7 formed thereon in that order, and thus, has alayer structure corresponding to the layer structure (1). However, whenthe layer of reference character 5 is an electron transport layer and anelectron injection layer, the electron transport layer, the electroninjection layer, and the back electrode 7 are laminated in that order atthe back electrode 7 side of the light-emitting layer 4.

The organic electroluminescent device shown in FIG. 10 has a transparentinsulator substrate 1, and a transparent electrode 2, a hole transportlayer and/or a hole injection layer 3, a light-emitting layer 4, anelectron transport layer and/or an electron injection layer 5, and aback electrode 7 formed thereon in that order, and thus, have a layerstructure corresponding to layer structure (2). However, when the layerindicated by reference character 3 is a hole transport layer and a holeinjection layer, the hole injection layer, the hole transport layer, anda light-emitting layer 4 are laminated in that order on the backelectrode 7 side of the transparent electrode 2. When the layerindicated by reference character 5 is an electron transport layer and anelectron injection layer, the electron transport layer, the electroninjection layer, and the back electrode 7 are laminated in that order onthe back electrode 7 side of the light-emitting layer 4.

The organic electroluminescent device shown in FIG. 11 has a transparentinsulator substrate 1, and a transparent electrode 2, a hole transportlayer and/or a hole injection layer 3, a light-emitting layer 4, and aback electrode 7 formed thereon in that order, and thus, has a layerstructure equivalent to layer structure (3). However, when the layerindicated by reference character 3 is a hole transport layer and a holeinjection layer, the hole injection layer, the hole transport layer, andthe light-emitting layer 4 are laminated in that order on the backelectrode 7 of the transparent electrode 2.

The organic electroluminescent device shown in FIG. 12 has a transparentinsulator substrate 1, and a transparent electrode 2, a light-emittinglayer having electric charge-transporting ability 6 and a back electrode7 formed thereon in that order.

Hereinafter, each layer structure will be described in detail.

The charge-transporting polyester according to an aspect of theinvention may have hole- or electron-transporting ability depending onthe function of the organic compound layer containing the polyester.

For example in the case of the layer structure of the organicelectroluminescent device shown in FIG. 9, the charge-transportingpolyester may be contained in any one of the light-emitting layer 4 orthe electron transport layer 5, and thus, the layer containing thecharge-transporting polyester may function either as a light-emittinglayer 4 or an electron transport layer 5. In the case of the layerstructure of the organic electroluminescent device shown in FIG. 10, thecharge-transporting polyester may be contained in any of the holetransport layer 3, the light-emitting layer 4, or the electron transportlayer 5, and thus, the layer containing it functions as a hole transportlayer 3, a light-emitting layer 4 or an electron transport layer 5. Inthe case of the layer structure of the organic electroluminescent deviceshown in FIG. 11, the charge-transporting polyester may be contained inany of the hole transport layer 3 or the light-emitting layer 4, andthus, the layer containing it functions as either as a hole transportlayer 3 or a light-emitting layer 4. In the case of the layer structureof the organic electroluminescent device shown in FIG. 12, thecharge-transporting polyester is contained in the light-emitting layerhaving electric charge-transporting ability 6, and thus, the layercontaining the charge-transporting polyester functions as alight-emitting layer having electric charge-transporting ability 6.

In the case of the layer structures of the organic electroluminescentdevices shown in FIGS. 9 to 12, the transparent insulator substrate 1may be transparent so as to allow transmission of the emitted light, andexamples thereof include, but are not limited to, glass and plasticfilms. The transparent electrode 2, similarly to the transparentinsulator substrate, is preferably transparent so as to allowtransmission of the emitted light, and preferably has a greater workfunction so as to ease hole injection, and examples thereof include, butare not limited to, oxide layers such as of indium tin oxide (ITO), tinoxide (NESA), indium oxide, and zinc oxide, and films formed by vapordeposition or sputtering of gold, platinum, palladium, or the like.

In the case of the layer structures of the organic electroluminescentdevices shown in FIGS. 9 and 10, the electron transport layer 5 may bemade only of a charge-transporting polyester having a functioncorresponding to the purpose (electron-transporting ability). As analternative, the electron transport layer 5 may additionally contain anelectron-transporting material other than the charge-transportingpolyester in an amount in the range of 1 to 50 wt % dispersed therein soas to adjust the electron mobility for the purpose of further improvingthe electrical properties. Examples of the electron-transportingmaterial include oxadiazole derivatives, nitro-substituted fluorenonederivatives, diphenoquinone derivatives, thiopyranedioxide derivatives,and fluorenylidenemethane derivatives. Specific examples include, butare not limited to, the following exemplary compounds (VIII-1) to(VIII-3). In addition, it may be used in combination with multipleelectron-transporting materials. When the charge-transporting polyesterabove is not used, the electron transport layer includes only one, ortwo or more, electron-transporting materials that may be selected fromthose described above.

In the case of the layer structures of the organic electroluminescentdevices shown in FIG. 10 and FIG. 11, the hole transport layer 3 may bemade only of a charge-transporting polyester having a functioncorresponding to the purpose (hole-transporting ability). As analternative, the hole transport layer 3 may additionally contain ahole-transporting material other than the charge-transporting polyesterin an amount in the range of 1 to 50 wt % dispersed therein so as toadjust the hole mobility. Examples of the hole-transporting materialsinclude tetraphenylenediamine derivatives, triphenylamine derivatives,carbazole derivatives, stilbene derivatives, arylhydrazone derivatives,and porphyrin compounds, and specific examples thereof include thefollowing exemplary compounds (IX-1) to (IX-9). Among them,tetraphenylenediamine derivatives are preferable because they aresuperior in compatibility with the charge-transporting polyester. As analternative, the hole transport layer may include a mixture of thecharge-transporting polyester and one or more other common resins. Whenthe charge-transporting polyester above is not used, the hole transportlayer includes only one, or two or more, charge-transporting materialsthat may be selected from those described above.

In the case of the layer structures of the organic EL devices shown inFIGS. 9 to 11, a compound having a high fluorescence quantum yield inthe solid state is used as the light-emitting material in thelight-emitting layer 4. When the light-emitting material is an organiclow-molecular weight compound, the compound should give a favorable thinfilm by vacuum deposition or application and drying of a solution ordispersion liquid containing the low-molecular weight compound and abinder resin. Alternatively when it is a polymer, the polymer shouldgive a favorable thin film by application and drying of a solution ordispersion liquid containing the polymer. Examples of the organiclow-molecular weight compound include chelating organic metal complexes,fused polynuclear aromatic ring compounds, perylene derivatives,coumarin derivatives, styrylarylene derivatives, silol derivatives,oxazole derivatives, oxathiazole derivatives, and oxadiazolederivatives, and examples of the polymer include poly-para-phenylenederivatives, poly-para-phenylene vinylene derivatives, polythiophenederivatives, polyacetylene derivatives, and polyfluorene derivatives.Specific examples include, but are not limited to, the followingcompounds (X-1) to (X-17).

[In structural formulae (X-13) to (X-17), each of n and x isindependently an integer of 1 or greater, y is 0 or 1; and in formulae(X-16) and (X-17), Ar represents a substituted or unsubstitutedmonovalent or bivalent aromatic group, and X represents a substituted orunsubstituted bivalent aromatic group].

A colorant compound as a guest material that is different form thelight-emitting material above may be doped to the light-emittingmaterial so as to improve the durability or luminous efficiency of theorganic electroluminescent device. The compound is doped by co-vapordeposition when a light-emitting layer is formed by vacuum deposition,or alternatively, the compound is mixed in a solution or dispersionliquid to achieve doping when the light-emitting layer is formed byapplication and drying of the solution or dispersion liquid. Theproportion of the colorant compound to be doped in the light-emittinglayer may be 0.001 to 40 wt %, preferably 0.01 to 10 wt %. The colorantcompound used for doping may be an organic compound superior incompatibility with the light-emitting material that allows formation ofa thin light-emitting layer, and examples thereof include DCMderivatives, quinacridone derivatives, rubrene derivatives, andporphyrin compounds. Specific examples include, but are not limited to,the following compounds (XI-1) to (XI-4).

The light-emitting layer 4 may be made only of the light-emittingmaterial above. As an alternative, the light-emitting layer may include1 to 50 wt % of the charge-transporting polyester above that isdispersed in the light-emitting material so as to further improve theelectrical properties and emission characteristics. As anotheralternative, the light-emitting layer may include 1 to 50 wt % of acharge-transporting material dispersed in the light-emitting material,the charge-transporting material being other than thecharge-transporting polyester described above. When thecharge-transporting polyester has light-emitting property additionally,it may be used as the light-emitting material, and in such a case, thelight-emitting layer may include 1 to 50 wt % of a charge-transportingmaterial dispersed in the light-emitting material so as to furtherimprove the electrical properties and emission characteristics, thecharge-transporting material being other than the charge-transportingpolyester described above.

In the case of the layer structure of the organic electroluminescentdevice shown in FIG. 12, the light-emitting layer having electriccharge-transporting ability 6 is an organic compound layer formed onlywith the charge-transporting polyester having a function correspondingto the purpose (hole-transporting ability or electron-transportingability) or an organic compound layer containing a light-emittingmaterial other than the charge-transporting polyester (preferably, atleast one material selected from the light-emitting materials (X-1) to(X-17) in an amount of 50 wt % or less) dispersed in thecharge-transporting polyester. Such a light-emitting layer 6 may furtherinclude 10 to 50 wt % of a charge-transporting material dispersedtherein so as to control the balance between the holes and electronsinjected into the organic electroluminescent device, thecharge-transporting material being other than the charge-transportingpolyester. Examples of the charge-transporting material used as theelectron-transporting material for control of electron mobility includeoxadiazole derivatives, nitro-substituted fluorenone derivatives,diphenoquinone derivatives, thiopyranedioxide derivatives, andfluorenylidenemethane derivatives. Specific examples thereof include theexemplary compounds (VIII-1) to (VIII-3) shown above.

Use of an organic compound not showing strong interaction with thecharge-transporting polyester is preferable; use of the followingexemplary compound (XII) is more preferable; but the compound is notlimited thereto.

Examples of the hole-transporting material usable when the hole mobilityis adjusted include tetraphenylenediamine derivatives, triphenylaminederivatives, carbazole derivatives, stilbene derivatives, arylhydrazonederivatives, and porphyrin compounds; specific examples include theexemplary compounds (IX-1) to (IX-9) shown above. Tetraphenylenediaminederivatives, which are superior in compatibility with thecharge-transporting polyester, are preferable.

In the case of the layer structures of the organic electroluminescentdevices shown in FIGS. 9 to 12, a metal allowing vacuum deposition andhaving a small work function permitting electron injection is generallyused for the back electrode 7, and examples thereof include magnesium,aluminum, silver, indium and alloys thereof, and metal halides and metaloxides such as lithium fluoride and lithium oxide. A protective layermay be formed additionally on the back electrode 7 so as to preventdeterioration of the device due to water and oxygen. Specific examplesof the material for the protective layer include metals such as In, Sn,Pb, Au, Cu, Ag, and Al; metal oxides such as MgO, SiO₂, and TiO₂; andresins such as polyethylene resin, polyurea resin, and polyimide resin.Vacuum deposition, sputtering, plasma polymerization, CVD, or coatingmay be used in forming the protective layer.

Each of these organic electroluminescent devices shown in FIGS. 9 to 12can be prepared first by forming the respective layers on a transparentelectrode 2 in the order according to the layer structure of the organicelectroluminescent device. The hole transport layer and/or holeinjection layer 3, light-emitting layer 4, electron transport layerand/or electron injection layer 5, or light-emitting layer havingelectric charge-transporting ability 6 is formed on the transparentelectrode, for example, by vacuum deposition of the materials describedabove or by dissolving or dispersing the materials in an appropriatesolvent to form a coating liquid, and providing the coating liquid onthe transparent electrode by spin coating, casting, dipping, or inkjet.Among the methods above, inkjet method is preferable because it allowsapplication of only a required amount of polymer material on thepositions of desired pixels, reduces undesirable consumption of thematerials, and is thus, friendly to global environment, allowshigh-definition patterning and easy expansion in size of the layer, andprovides a greater degree of freedom of the medium on which the printingis conducted on.

The thickness of each of the hole transport layer and/or hole injectionlayer 3, light-emitting layer 4, electron transport layer and/orelectron injection layer 5, and the thickness of the light-emittinglayer having electric charge-transporting ability 6 is preferably in therange of 10 μl or less, more preferably 0.001 to 5 μm. The dispersionstate of respective materials above (e.g., non-conjugated polymer,light-emitting material, etc.) may be molecular dispersion state orfine-particle state containing fine crystals. The dispersion solvent tobe used in the film-forming method using a coating solution may beselected appropriately according to the dispersibility and solubility ofthe respective materials so as to realize the molecular dispersionstate. A ball mill, a sand mill, a paint shaker, an attriter, ahomogenizer, ultrasonic wave, or the like can be used for dispersing thematerials to the fine particle state.

In the case of the organic electroluminescent devices shown in FIGS. 9and 10, the organic electroluminescent device according to an aspect ofthe invention can be prepared by forming a back electrode 7 on theelectron transport layer and/or the electron injection layer 5, forexample, by vacuum deposition or sputtering. The organicelectroluminescent device according to an aspect of the invention can beprepared by forming a back electrode 7, for example by vacuum depositionor sputtering on the light-emitting layer 4 in the case of the organicelectroluminescent device shown in FIG. 11 and on the light-emittinglayer having electric charge-transporting ability 6 in the case of theorganic electroluminescent device shown in FIG. 11.

Light is emitted from the organic electroluminescent device according anaspect of the invention, when, for example, a DC voltage of 4 to 20 V ata current density of 1 to 200 mA/cm² is applied between the pair ofelectrodes.

—Image Display Medium—

The image display medium in which the organic electroluminescent deviceaccording to an aspect of the invention is used will be described below.

The organic electroluminescent devices according to an aspect of theinvention may be arranged in a matrix and/or segment shape to form animage display medium. In arranging the organic electroluminescentdevices in the matrix shape, only electrodes may be disposed in thematrix shape, or both electrodes and organic compound layers may bedisposed in the matrix shape. When arranging the organicelectroluminescent devices in the segment shape, only electrodes may bedisposed in the segment shape, or both electrodes and organic compoundlayers may be disposed in the segment shape.

The organic compound layers disposed in the matrix or segment shape canbe prepared easily by the inkjet printing method above.

EXAMPLES

Hereinafter, the present invention will be described with reference toExamples, but it should be understood that the invention is not limitedthereto. “Part” and “%” in the following Examples are based on weight(i.e., part by weight and % by weight).

Example 1

Acetanilide (25.0 g), methyl 4-iodophenylpropionate (64.4 g), potassiumcarbonate (38.3 g), copper sulfate pentahydrate (2.3 g), and n-tridecane(50 ml) are placed in a 500-ml three-necked flask, and the mixture isstirred under heat and nitrogen stream at 230° C. for 20 hours. Afterreaction, a solution of potassium hydroxide (15.6 g) in ethylene glycol(300 ml) is added thereto; the mixture is heated under reflux undernitrogen stream for 3.5 hours, and cooled to room temperature; and thereaction solution is poured into 1 L of distilled water and neutralizedwith hydrochloric acid, to give a crystalline precipitate. The crystalis collected by suction filtration, washed thoroughly with water, andtransferred into a 1-L flask. Toluene (500 ml) is added thereto; themixture is heated under reflux, while water is removed by azeotropicdistillation; a solution of conc. sulfuric acid (1.5 ml) in methanol(300 ml) is added; and the mixture is heated under reflux under nitrogenstream for 5 hours. After reaction, the product is extracted withtoluene, and the organic layer is washed with water thoroughly. Thenafter drying over anhydrous sodium sulfate, the solvent is removed underreduced pressure, and the residue is recrystallized from hexane, to give36.5 g of DAA-1.

Tetrakis(triphenyl)phosphine palladium (0.4 g), toluene (15 ml),2,7-diiodo-9,9-dimethylfluorene (5 g), sodium hydrogen carbonate aqueoussolution (6 ml), 5-chlorothiophene-2-boronic acid (2 g), and ethanol (5ml) are placed in a 100-ml three-necked round-bottomed flask, and themixture is heated under reflux in a nitrogen environment for 4 hours.After reaction, the mixture is allowed to cool to room temperature; theaqueous and organic layers are separated; and the organic layer iswashed with saturated aqueous sodium chloride solution. The solvent isremoved under reduced pressure, to give a crude product. The residue ispurified by silica gel chromatography using hexane, to give 1.1 g of[intermediate 1].

DAA-1 (0.8 g), [intermediate 1] (1.1 g), potassium carbonate (0.6 g),copper sulfate pentahydrate (0.1 g), and o-dichlorobenzene (2 ml) areplaced in a 25-ml three-necked flask, and the mixture is stirred underheat and under nitrogen stream at 180° C. for 15 hours. After reaction,the mixture is allowed to cool to 100° C. and dissolved in toluene; theinsoluble matter is removed by Celite filtration while hot; and thefiltrate is purified by silica gel column chromatography using ethylacetate/hexane, to give 1.1 g of TAA-1.

Nickel chloride (0.3 g), triphenylphosphine (2.1 g), and anhydrous DMF(4 ml) are placed in a 25-ml three-necked flask; the mixture is heatedto 50° C.; and after addition of zinc (0.1 g), the mixture is stirred at50° C. for 1 hour. TAA-1 (1.0 g) and anhydrous DMF (3 ml) are addedthen, and the mixture is stirred additionally for 2.5 hours. Aftertermination of the reaction, the mixture is poured into water (80 ml);the aqueous and organic layers are separated; the organic layer iswashed and, after drying over anhydrous sodium sulfate, the solvent isremoved under reduced pressure, to give a crude product. The product ispurified by silica gel column chromatography using ethyl acetate/hexane,to give 0.6 g of an exemplary compound 5 (yield: 66%). The melting pointof the exemplary compound 5 thus obtained is 223 to 225° C. The infraredabsorption spectrum of the exemplary compound 5 obtained is shown inFIG. 1, and the NMR spectrum (1H-NMR, solvent: CDCl₃, the same shallapply in NMR spectra below) in FIG. 2.

Example 2

The intermediate 1 (4.0 g), methyl 4-acetamidophenylpropionate (26.9 g),potassium carbonate (3.7 g), copper sulfate pentahydrate (0.4 g), ando-dichlorobenzene (20 ml) are placed in a 100-ml three-necked flask, andthe mixture is stirred under heat and nitrogen stream at 185° C. for13.5 hours. After termination of the reaction, a solution of potassiumhydroxide (1.3 g) in ethylene glycol (25 ml) is added, and the mixtureis heated under reflux under nitrogen stream for 5 hours. Aftertermination of the reaction, the mixture is allowed to cool to roomtemperature, and, after being added to distilled water (200 ml), isneutralized with hydrochloric acid, to give a crystalline precipitate.The crystal is collected by filtration, washed thoroughly with water,and transferred into a 1-L flask. Toluene (300 ml) is added thereto; themixture is heated under reflux to remove water by azeotropicdistillation; then methanol (100 ml) and conc. sulfuric acid (0.5 ml)are added thereto; and the mixture is heated under reflux under nitrogenstream for 4.5 hours. After termination of the reaction, the reactionproduct is poured into distilled water and extracted with toluene. Theorganic layer is washed thoroughly with distilled water and dried overanhydrous sodium sulfate; the solvent is removed under reduced pressure;and the residue is recrystallized from an ethyl acetate/hexane liquidmixture, to give 2.8 g of DAA-2.

An intermediate 2 is prepared in a similar manner to the preparation ofintermediate 1, except that 5-chlorothiophene-2-boronic acid is replacedwith thiophene-2-boronic acid.

DAA-2 (1.1 g), the intermediate 2 (1.4 g), potassium carbonate (0.7 g),copper sulfate pentahydrate (0.1 g), and o-dichlorobenzene (2 ml) areplaced in a 50-ml three-necked flask, and the mixture is stirred underheat and nitrogen stream at 180° C. for 12 hours. After termination ofthe reaction, the mixture is allowed to cool to 100° C. and dissolved in100 ml of toluene; the insoluble matter is removed by Celite filtrationwhile hot; and the filtrate is purified by silica gel columnchromatography using toluene, to give 1.7 g of TAA-2.

Nickel chloride (0.2 g), triphenylphosphine (1.4 g), and anhydrous DMF(5 ml) are placed in a 25-ml three-necked flask, and the mixture isheated to 50° C. and, after addition of zinc (0.1 g), stirred at 50° C.for 1 hour. TAA-2 (0.7 g) is then added, and the mixture is stirredadditionally for 2.5 hours. After termination of the reaction, thereaction product is poured into water (50 ml), and the precipitatedsolid is collected by suction filtration, to give a crude product. Thecrude product is purified by silica gel column chromatography using anethyl acetate/hexane/toluene mixture solution, to give 0.6 g of anexemplary compound 22 (yield: 90%). The melting point of the exemplarycompound 22 obtained is 176 to 180° C. The infrared absorption spectrumof the exemplary compound 22 obtained is shown in FIG. 3, and the NMRspectrum thereof is shown in FIG. 4.

Example 3

Magnesium (0.2 g) is placed in a 50-ml three-necked flask, baked with aburner, and cooled to room temperature. Ether (2 ml),5-chloro-2-iodo-3-(2,4-dimethylphenyl)thiophene (3.1 g), and ether (8ml) are added thereto, and the mixture is heated under reflux for 15minutes. After confirmation of consumption of magnesium, the mixture iscooled to room temperature, to give a Grignard reagent. Separately, Pd(dppf)Cl₂ (0.1 g), 2,7-diiodo-9,9-dimethylfluorene (3.6 g), and toluene(20 ml) are placed in a 100-ml three-necked flask, and the Grignardreagent is added thereto dropwise. After dropwise addition, the mixtureis stirred at room temperature for 6 hours. After termination of thereaction, the mixture is made acidic by addition of hydrochloric acidand separated into aqueous and organic layers. The organic layer iswashed with distilled water and dried over anhydrous sodium sulfate. Thesolvent is removed under reduced pressure, to give a crude product. Thecrude product is purified by silica gel chromatography using hexane, togive 1.1 g of an intermediate 3.

2-Hexyl-5-(2-iodo-9,9-dimethylfluorenyl)thiophene (2.2 g),acetamidophenylpropionic methyl ester (0.9 g), potassium carbonate (0.9g), and copper sulfate pentahydrate (0.1 g), and o-dichlorobenzene (3ml) are placed in a 50-ml three-necked flask, and the mixture is heatedunder reflux under nitrogen stream for 16 hours. After termination ofthe reaction, the mixture is allowed to cool to room temperature anddissolved in 100 ml of toluene; the insoluble matter is removed byfiltration; and the filtrate is purified by silica gel columnchromatography using an ethyl acetate/hexane liquid mixture, to give 1.9g of DAA-3.

DAA-3 (0.9 g), the intermediate 3 (1.1 g), potassium carbonate (0.4 g),copper sulfate pentahydrate (0.1 g), and o-dichlorobenzene (3 ml) areplaced in a 50-ml three-necked flask, and the mixture is heated underreflux under nitrogen stream at 180° C. for 24 hours. After terminationof the reaction, the mixture is cooled to 100° C. and dissolved in 100ml of toluene; the insoluble matter is removed by Celite filtrationwhile hot; and the filtrate is purified by silica gel columnchromatography using an ethyl acetate/hexane liquid mixture, to give 1.2g of TAA-3.

Nickel chloride (0.2 g), triphenylphosphine (1.1 g), and anhydrous DMF(5 ml) are placed in a 25-ml three-necked flask, and the mixture isheated to 50° C. and, after addition of zinc (0.1 g), stirred at 50° C.for 1 hour. TAA-3 (0.7 g) is then added, and the mixture is stirredadditionally for 2.5 hours. After termination of the reaction, thereaction product is poured into water (50 ml), and the precipitatedsolid is collected by suction filtration, to give a crude product. Thecrude product is purified by silica gel column chromatography using anethyl acetate/hexane mixture solution, to give 0.6 g of an exemplarycompound 23 (yield: 85%). The melting point of the exemplary compound 23obtained is indefinite. The infrared absorption spectrum of theexemplary compound 23 obtained is shown in FIG. 5, and the NMR spectrumthereof is shown in FIG. 6.

Example 4

1.0 g of the exemplary compound 5 obtained in Example 1, 5.0 ml ofethylene glycol and 0.02 g of tetrabutoxytitanium are placed in a 50-mlthree-necked round-bottomed flask, and, the mixture is stirred underheat and nitrogen stream at 205° C. for 5 hours. After confirmation ofconsumption of the raw material diamine by TLC, the mixture is heated to210° C. under a reduce pressure of 0.5 mm Hg and allowed to react for 5hours while ethylene glycol is distilled off. The mixture is then cooledto room temperature and dissolved in 50 ml of monochlorobenzene; theinsoluble matter is removed by filtration through a 0.5-μmpolytetrafluoroethylene (PTFE) filter; and the filtrate is addeddropwise into 500 ml of stirred methanol, to give a polymer precipitate.The polymer obtained is collected by filtration, washed thoroughly withmethanol, and dried, to give 0.7 g of a polymer [exemplary compound:(1)]. Analysis of the molecular weight of the polymer by gel-permeationchromatography (GPC) (HLC-8120GPC, manufactured by Toso Corporation)showed a MW of 1.83×10⁵ (in terms of styrene) and a Mw/Mn of 3.51, andthe polymerization degree p as determined from the monomer molecularweight is approximately 173. The infrared absorption spectrum of theexemplary compound (1) obtained is shown in FIG. 7 and the NMR spectrumthereof is shown in FIG. 8.

Example 5

1.0 g of the exemplary compound 22 obtained in Example 2, 8.0 ml ofethylene glycol and 0.02 g of tetrabutoxytitanium are placed in a 50-mlthree-necked round-bottomed flask, and the mixture is stirred under heatand nitrogen stream at 200° C. for 7 hours. After confirmation ofconsumption of the raw material diamine by TLC, the pressure is reducedto 0.5 mmHg, and the mixture is heated to 210° C. and allowed to reactfor 5 hours while ethylene glycol is distilled off. The mixture is thencooled to room temperature and dissolved in 50 ml of monochlorobenzene;the insoluble matter is removed by filtration through a 0.5-μm PTFEfilter; and the filtrate is added dropwise into 500 ml of stirredmethanol, to give a polymer precipitate. The polymer obtained iscollected by filtration, washed thoroughly with methanol, and dried, togive 0.9 g of a polymer [exemplary compound: (14)]. Analysis of themolecular weight of the polymer by GPC showed a Mw of 8.56×10⁴ (in termsof styrene) and an Mw/Mn of 3.24, and the polymerization degree p asdetermined from the monomer molecular weight is approximately 59.

Example 6

0.8 g of the exemplary compound 23 obtained in Example 3, 8.0 ml ofethylene glycol and 0.02 g of tetrabutoxytitanium are placed in a 50-mlthree-necked round-bottomed flask, and the mixture is heated under heatand nitrogen stream at 200° C. for 8 hours. After confirmation ofconsumption of the raw material diamine, the pressure is reduced to 0.5mmHg, and the mixture is heated to 200° C. and allowed to react for 4hours while ethylene glycol is distilled off. The mixture is then cooledto room temperature and dissolved in 50 ml of monochlorobenzene; theinsoluble matter is removed by filtration through a 0.5-1 μm PTFEfilter; and the filtrate is added dropwise into 500 ml of stirredmethanol, to give a polymer precipitate. The polymer obtained iscollected by filtration, washed thoroughly with methanol, and dried, togive 0.9 g of a polymer [exemplary compound: (17)]. Analysis of themolecular weight of the polymer by GPC showed a Mw of 1.04×10⁵ (in termsof styrene) and a Mw/Mn of 4.34, and the polymerization degree p asdetermined from the monomer molecular weight is approximately 64.

Example 7

0.5 g of the exemplary compound 5 obtained in Example 1, 0.5 g ofterephthalic acid, 5.0 ml of ethylene glycol and 0.02 g oftetrabutoxytitanium are placed in a 50-ml three-necked round-bottomedflask, and the mixture is stirred under heat and nitrogen stream at 200°C. for 5 hours. After confirmation of consumption of the raw materialdiamine by TLC, the pressure is reduced to 0.5 mmHg, and the mixture isheated to 200° C. and allowed to react for 7 hours while ethylene glycolis distilled off. The mixture is then cooled to room temperature anddissolved in 50 ml of monochlorobenzene; the insoluble matter is removedby filtration through a 0.5-μm PTFE filter; and the filtrate is addeddropwise into 500 ml of stirred methanol, to give a polymer precipitate.The polymer obtained is collected by filtration, washed thoroughly withmethanol, and dried, to give 0.9 g of a polymer [exemplary compound:(4)]. Analysis of the molecular weight of the polymer by GPC showed a Mwof 1.22×10⁵ (in terms of styrene) and a Mw/Mn of 3.16, and thepolymerization degree p as determined from the monomer molecular weightis approximately 95.

Comparative Example 1

MEH-PPV ((Poly[2-methoxy-5-(2′-ethylhexyloxy)-1,4-phenylenevinylene](weight-average molecular weight: 86,000)) is prepared and used as aComparative Example for comparison with the thiophene-containingcompounds and thiophene-containing compound polymers thus obtained inExamples according to an aspect of the invention.

The mobility of the thiophene-containing compounds orthiophene-containing compound polymers obtained in Examples 1 to 7according to an aspect of the invention, and the mobility of the sampleof Comparative Example 1 is determined by a time-of-flight method(TOF-401, manufactured by Optel), and the glass transition temperaturethereof is measured by differential scanning calorimetry (DSC)(Tg/DTA6200, manufactured by Seiko Instruments Inc.). The mobilitymeasurement is conducted on a film in which 40 wt % (20 wt %, only inExample 2) of the sample is dispersed in polycarbonate when the sampleis a monomer. When the sample is a polymer, the mobility measurement isconducted on a film obtained from the sample dissolved in a solvent. Theabsorption spectrum is determined in an ultraviolet-visible absorptionanalyzer (U-4000, manufactured by Hitachi), and the emission spectrum isdetermined by using a He—Cd laser (excitation wavelength: 325 nm) as theexcitation light source and a multi-channel detector (PMA-11,manufactured by Hamamatsu Photonics) as the detector. The results aresummarized in Table 70.

TABLE 70 Absorption Emission Glass wave- wave- transition Mobilitylength λ length λ temperature (cm²/Vs) max (nm) max (nm) (° C.) Compoundof 1.1 × 10⁻⁵ 427 524 90 Example 1 Compound of 3.3 × 10⁷  423 510 116Example 2 Compound of 3.5 × 10⁻⁵ 410 509 119 Example 3 Compound of 4.3 ×10⁻⁵ 414 541 158 Example 4 Compound of 1.0 × 10⁻⁴ 425 517 125 Example 5Compound of 4.8 × 10⁻⁴ 412 510 156 Example 6 Compound of 5.0 × 10⁻⁵ 420535 143 Example 7 Comparative 10⁻⁷ to 10⁻⁸ 479 550 75 Example 1(MEH-PPV)

As is apparent from the results in Table 70, the thiophene-containingcompounds and thiophene-containing compound polymers according to anaspect of the invention may have high mobility and favorable emissioncharacteristics.

Preparative Example 1 Charge-Transporting Polyester (13)

A diamine 29 (following monomer (XIII)) is prepared according to thefollowing method:

25.0 g of acetanilide, 64.4 g of methyl 4-iodophenylpropionate, 38.3 gof potassium carbonate, 2.3 g of copper sulfate pentahydrate, and 50 mlof n-tridecane are placed in a 500-ml three-necked flask, and themixture is stirred under heat and nitrogen stream at 230° C. for 20hours. After termination of the reaction, a solution of 15.6 g ofpotassium hydroxide in 300 ml of ethylene glycol is added thereto; themixture is heated under reflux under nitrogen stream for 3.5 hours andthen cooled to room temperature; and the reaction solution is pouredinto 1 L of distilled water and neutralized with hydrochloric acid, togive a crystalline precipitate. The crystal is collected by suctionfiltration, washed thoroughly with water, and transferred into a 1-Lflask. After addition of 500 ml of toluene, the mixture is heated underreflux to remove water by azeotropic distillation; a solution of 1.5 mlof conc. sulfuric acid in 300 ml of methanol is added thereto; and themixture is heated under reflux under nitrogen stream for 5 hours. Afterreaction, the product is extracted with toluene, and the organic layeris washed thoroughly with distilled water. Then after drying overanhydrous sodium sulfate, the solvent is removed under reduced pressure,and the residue is recrystallized from hexane, to give 36.5 g of DAA-1.

0.4 g of tetrakis(triphenyl)phosphine palladium, 15 ml of toluene, 5 gof 2,7-diiodo-9,9-dimethylfluorene, 6 ml of aqueous sodium hydrogencarbonate solution, 2 g of 5-chlorothiophene-2-boronic acid, and 5 ml ofethanol are placed in a 100-ml three-necked round-bottomed flask, andthe mixture is heated under reflux in nitrogen environment for 4 hours.After termination of the reaction, the mixture is cooled to roomtemperature; the aqueous and organic layers are separated; and theorganic layer is washed with aqueous saturated sodium chloride solution.Removal of the solvent under reduced pressure gives a crude product. Itis purified by silica gel chromatography using hexane, to give 1.1 g of[intermediate 1].

0.8 g of DAA-1, 1.1 g of [intermediate 1], 0.6 g of potassium carbonate,0.1 g of copper sulfate pentahydrate, and 2 ml of o-dichlorobenzene areplaced in a 25-ml three-necked flask, and the mixture is stirred underheat under nitrogen stream at 180° C. for 15 hours. After termination ofthe reaction, the mixture is cooled to 100° C. and dissolved in toluene;the insoluble matter is removed by Celite filtration while hot, and thefiltrate is purified by silica gel column chromatography using ethylacetate/hexane, to give 1.1 g of TAA-1.

0.3 g of nickel chloride, 2.1 g of triphenylphosphine, and 4 ml ofanhydrous DMF are place in a 25-ml three-necked flask; the mixture isheated to 50° C.; and, after addition of 0.1 g of zinc, the mixture isstirred under heat at 50° C. for 1 hour. Then, 1.0 g of TAA-1 and 3 mlof anhydrous DMF are added, and the mixture is stirred additionally for2.5 hours. After termination of the reaction, the mixture is poured into80 ml of water; after separation into aqueous and organic layers, theorganic layer is washed and dried over anhydrous sodium sulfate, andremoval of the solvent under reduced pressure gives a crude product. Itis purified by silica gel column chromatography using ethylacetate/hexane, to give 0.6 g of diamine 29 (yield 66%).

Then, 1.0 g of diamine 29 (the monomer (XIII)), 10.0 ml of ethyleneglycol and 0.02 g of tetrabutoxytitanium are placed in a 50-mlthree-necked round-bottomed flask, and the mixture is stirred under heatunder nitrogen stream at 200° C. for 6.5 hours. After confirming thatthe raw material diamine 29 (the monomer (XIII)) is consumed, themixture is heated to 210° C. under a reduced pressure of 0.5 mm Hg andallowed to react for 4 hours while distilling off ethylene glycol. Then,the mixture is cooled to room temperature and dissolved in 50 ml ofmonochlorobenzene; the insoluble matter is removed by filtration througha polytetrafluoroethylene (PTFE) filter having an opening of 0.5 μm; andthe filtrate is added dropwise into 500 ml of methanol while stirred,allowing precipitation of polymer. The polymer obtained is filtered,washed thoroughly with methanol, and dried, to give 1.1 g of thecharge-transporting polyester (13) above. Molecular weight analysis byGPC gel-permeation chromatography (GPC) shows a Mw of 1.03×10⁵ (in termsof styrene) and a Mn/Mw of 2.35, and thus, the polymerization degree pas determined from the monomer molecular weight is approximately 97.

Preparative Example 2 Charge-Transporting Polyester (52)

A diamine 141 (the following monomer (XIV)) is prepared according to thefollowing method.

0.2 g of magnesium is placed in a 50-ml three-necked flask, baked with aburner, and then cooled to room temperature. 2 ml of ether, 3.1 g of5-chloro-2-iodo-3-(2,4-dimethylphenyl)thiophene, and 8 ml of ether arethen added thereto, and the mixture is heated under reflux for 15minutes. After confirmation of consumption of magnesium, the mixture iscooled to room temperature, to give a Grignard reagent. Separately, 0.1g of Pd (dppf)Cl₂, 3.6 g of 2,7-diiodo-9,9-dimethylfluorene, and 20 mlof toluene are placed in a 100-ml three-necked flask, and the Grignardreagent is added dropwise. After dropwise addition, the mixture isstirred at room temperature for 6 hours. After termination of thereaction, the mixture is made acidic by addition of hydrochloric acidand separated into aqueous and organic layers. The organic layer iswashed with distilled water and dried over anhydrous sodium sulfate. Thesolvent is removed under reduced pressure, to give a crude product. Thecrude product is purified by silica gel chromatography using hexane, togive 1.1 g of [intermediate 2].

Then, coupling reaction with DAA-1 prepared in Preparative Example 1 isconducted in the same manner as Preparative Example 1, except that the[intermediate 2] is used instead of the [intermediate 1], to give TAA-2.The TAA-2 is homo-coupled in a similar manner to Preparative Example 1,to give a diamine 141.

Then, 1.0 g of diamine 141 (the monomer (XIV)), 10.0 ml of ethyleneglycol and 0.02 g of tetrabutoxytitanium are placed in a 50-mlthree-necked round-bottomed flask, and the mixture is stirred under heatand nitrogen stream at 200° C. for 8 hours. After confirmation ofconsumption of the raw material diamine 141 (the monomer (XIV)) by TLC,the mixture is heated to 210° C. at a reduced pressure of 0.5 mm Hgadditionally for 5 hours while distilling off ethylene glycol. Themixture is then cooled to room temperature and dissolved in 50 ml ofmonochlorobenzene; the insoluble matter is then removed by filteredthrough a 0.5-μm PTFE filter; and the filtrate is added dropwise into500 ml of stirred methanol, to give a polymer precipitate. The polymerobtained is collected by filtration, washed thoroughly with methanol,and dried to give 0.8 g of a charge-transporting polyester (52).Molecular weight analysis by GPC showed a Mw of 1.05×10⁵ (in terms ofstyrene) and an Mw/Mn of 2.89, and the polymerization degree p asdetermined from the monomer molecular weight is approximately 69.

Preparative Example 3 Charge-Transporting Polyester (57)

A diamine 147 (the following monomer (XV)) is first prepared accordingto the following method.

An [intermediate 2] is first prepared in a similar manner to PreparativeExample 2.

2.2 g of 2-hexyl-5-(2-iodo-9,9-dimethylfluorenyl)thiophene, 0.9 g ofacetamidophenylpropionic methyl ester, 0.9 g of potassium carbonate, 0.1g of copper sulfate pentahydrate, and 3 ml of o-dichlorobenzene areplaced in a 50-ml three-necked flask, and the mixture is heated underreflux under nitrogen stream for 16 hours. After termination of thereaction, the mixture is cooled to room temperature and dissolved in 100ml of toluene; the insoluble matter is removed by filtration; and thefiltrate is purified by silica gel column chromatography using an ethylacetate/hexane liquid mixture, to give 1.9 g of DAA-3.

0.9 g of DAA-3, 1.1 g of [intermediate 2], 0.4 g of potassium carbonate,0.1 g of copper sulfate pentahydrate, and 3 ml of o-dichlorobenzene areplaced in a 50-ml three-necked flask, and the mixture is heated underreflux and under nitrogen stream at 180° C. for 24 hours. Aftertermination of the reaction, the mixture is cooled to 100° C. anddissolved in 100 ml of toluene; the insoluble matter is removed byCelite filtration while hot; and the filtrate is purified by silica gelcolumn chromatography using an ethyl acetate/hexane liquid mixture, togive 1.2 g of TAA-3.

0.2 g of nickel chloride, 1.1 g of triphenylphosphine, and 5 ml ofanhydrous DMF are placed in a 25-ml three-necked flask, and the mixtureis heated to 50° C. After 0.1 g of zinc is added, the mixture is stirredat 50° C. for 1 hour. 0.7 g of TAA-3 is then added, and the mixture isstirred additionally for 2.5 hours. After termination of the reaction,the mixture is poured into 50 ml of water, and the precipitated solid iscollected by suction filtration, to give a crude product. It is purifiedby silica gel column chromatography using an ethyl acetate/hexanemixture solution, to give 0.6 g of a diamine 147 (yield: 85%).

Then, 1.0 g of the diamine 147 (the monomer (XV)), 10.0 ml of ethyleneglycol and 0.02 g of tetrabutoxytitanium are placed in a 50-mlthree-necked round-bottomed flask, and the mixture is stirred under heatand nitrogen stream at 200° C. for 7 hours. After confirmation ofconsumption of the raw material diamine 147 (the monomer (XV)), themixture is heated to 200° C. under a reduced pressure of 0.5 mm Hg for 4hours while distilling off ethylene glycol. Then, the mixture is cooledto room temperature and dissolved in 50 ml of monochlorobenzene; theinsoluble matter is removed by filtration through a 0.5-μm PTFE filter;and the filtrate is added dropwise into 500 ml of stirred methanol, togive a polymer precipitate. The polymer obtained is collected byfiltration, washed thoroughly with methanol, and dried, to give 0.9 g ofa charge-transporting polyester (57). Molecular weight analysis by GPCshowed a Mw of 8.73×10⁴ (in terms of styrene) and a Mw/Mn of 2.95, andthe polymerization degree p as determined from the monomer molecularweight is approximately 69.

Preparative Example 4 Charge-Transporting Polyester (27)

A diamine 70 (the following monomer (XVI)) is first prepared accordingto the following method.

0.2 g of magnesium is placed in a 50-ml three-necked flask, baked with aburner, and then cooled to room temperature. 2 ml of ether and 3.0 g of5-chloro-2-iodo-3-(2,4-dimethylphenyl)thiophene are added thereto, andthe mixture is heated under reflux for 15 minutes. After confirmation ofconsumption of magnesium, the mixture is cooled to room temperature, togive a Grignard reagent. Then, 0.1 g of Pd(dppf)Cl₂, 3.6 g of2,7-diiodo-9,9-dimethylfluorene, and 20 ml of toluene are placed in a100 ml three-necked flask, and the Grignard reagent is added dropwisethereto. After dropwise addition, the mixture is stirred at roomtemperature for 6.5 hours. After termination of the reaction, themixture is made acidic by addition of hydrochloric acid and separatedinto aqueous and organic layers. The organic layer is washed withdistilled water and dried over anhydrous sodium sulfate. The solvent isremoved under reduced pressure, to give a crude product. The crudeproduct is purified by silica gel chromatography using hexane, to give1.3 g of [intermediate 4].

Then, the diamine 70 is prepared in the same manner as PreparativeExample 2, except that the [intermediate 2] is replaced with the[intermediate 4].

Then, 1.0 g of diamine 70 (the monomer (XVI), 10.0 ml of ethylene glycoland 0.02 g of tetrabutoxytitanium are placed in a 50-ml three-neckedround-bottomed flask, and the mixture is stirred under heat and nitrogenstream at 200° C. for 5 hours. After confirmation of consumption of thediamine 70 (the monomer (XVI)), the mixture is heated to 210° C. at areduced pressure of 0.5 mm Hg and allowed to react for 4 hours whiledistilling off ethylene glycol. The mixture is then cooled to roomtemperature and dissolved in 50 ml of monochlorobenzene; the insolublematter is removed by filtration through a 0.5-μm PTFE filter; and thefiltrate is added dropwise into to 500 ml of stirred methanol, to give apolymer precipitate. The polymer obtained is collected by filtration,washed thoroughly with methanol, and dried, to give 1.0 g of acharge-transporting polyester (27). Molecular weight analysis by GPCshowed a Mw of 1.27×10⁵ (in terms of styrene) and an Mw/Mn of 2.52, andthe polymerization degree p as determined from the monomer molecularweight is approximately 80.

Preparative Example 5 Charge-Transporting Polyester (71)

A diamine 271 (the following monomer (XVII)) is first prepared accordingto the following method.

The diamine 271 is prepared in the same manner as Preparative Example 1,except that acetanilide is replaced with 4-bithienylacetanilide and2,7-diiodo-9,9-dimethylfluorene is replaced with2,7-diiodo-9,9-dihexylfluorene.

Then, 1.0 g of diamine 271 (the monomer (XVII)), 10.0 ml ethylene glycoland 0.02 g of tetrabutoxytitanium are placed in a 50-ml three-neckedround-bottomed flask, and the mixture is stirred under heat and nitrogenstream at 200° C. for 6 hours. After confirmation of consumption of thediamine 271 (the monomer (XVII)), the mixture is heated to 210° C. at areduced pressure of 0.5 mm Hg and allowed to react for 4 hours whiledistilling off ethylene glycol. The mixture is then cooled to roomtemperature and dissolved in 50 ml of monochlorobenzene; the insolublematter is removed by filtration through a 0.5-μm PTFE filter; and thefiltrate is added dropwise into to 500 ml of stirred methanol, to give apolymer precipitate. The polymer obtained is collected by filtration,washed thoroughly with methanol, and dried, to give 1.0 g of acharge-transporting polyester (71). Molecular weight analysis by GPCshowed a Mw of 1.09×10⁵ (in terms of styrene) and an Mw/Mn of 2.99, andthe polymerization degree p as determined from the monomer molecularweight is approximately 60.

Preparative Example 6 Charge-Transporting Polyester (75)

A diamine 340 (the following monomer (XVIII)) is first preparedaccording to the following method.

DAA-4 is prepared in the same manner as Preparative Example 1, exceptthat acetanilide is replaced with 4-(9,9-dimethylfluorenyl)acetanilide.Then, a diamine 340 is prepared in the same manner as PreparativeExample 2, except that DAA-1 is replaced with the DAA-4.

Then, 1.0 g of the diamine 340 (the monomer (XVIII)), 10.0 ml ofethylene glycol and 0.02 g of tetrabutoxytitanium are placed in a 50-mlthree-necked round-bottomed flask, and the mixture is stirred under heatand nitrogen stream at 200° C. for 6 hours. After confirmation ofconsumption of the diamine 340 (the monomer (XVIII)), the mixture isheated to 210° C. at a reduced pressure of 0.5 mm Hg and allowed toreact for 4 hours while distilling off ethylene glycol. The mixture isthen cooled to room temperature and dissolved in 50 ml ofmonochlorobenzene; the insoluble matter is removed by filtration througha 0.5-μm PTFE filter; and the filtrate is added dropwise into to 500 mlof stirred methanol, to give a polymer precipitate. The polymer obtainedis collected by filtration, washed thoroughly with methanol, and dried,to give 1.0 g of the charge-transporting polyester (75). Molecularweight analysis by GPC showed a Mw of 1.29×10⁵ (in terms of styrene) andan Mw/Mn of 2.88, and the polymerization degree p as determined from themonomer molecular weight is approximately 72.

Then, devices are prepared in the following manner, using thecharge-transporting polyesters prepared by the methods above:

Example 8

A glass substrate of 2 mm in width on which an strip-shaped ITOelectrode has been formed by etching is ultrasonicated sequentially in aneutral detergent solution, ultrapure water, acetone (for electronicindustry, manufactured by Kanto Kagaku), and 2-propanol (for electronicindustry, manufactured by Kanto Kagaku) in that order for five minuteseach, whereby the glass substrate is cleaned; and, after drying, a 5%chlorobenzene solution containing a light-emitting polymer (followingcompound (XIX), polyfluorene-based) (Mw: ca. 10⁵) as the light-emittingmaterial is prepared, filtered though a 0.1-μm polytetrafluoroethylene(PTFE) filter, and coated thereon by spin coating, to form alight-emitting layer having a thickness of 0.03 μm. After sufficientdrying, a 5% dichloroethane solution containing the charge-transportingpolyester (13) prepared in Preparative Example 1 above as theelectron-transporting material is prepared, filtered though a 0.1-μmPTFE filter, and coated on the light-emitting layer by spin coating, toform an electron transport layer having a thickness of 0.03 μm. Finally,a Mg—Ag alloy is co-deposited thereon to form a back electrode having awidth of 2 mm and a thickness of 0.15 μm such that the back electrodeintersects with the ITO electrode. The effective area of the organic ELdevice formed is 0.04 cm².

Example 9

After ultrasonication in a similar manner to Example 8, a 5%chlorobenzene solution containing the charge-transporting polymer(compound (IX-9), polyester-based) (Mw: ca. 10⁵) as thehole-transporting material which has been filtered through a 0.1-μmpolytetrafluoroethylene (PTFE) filter is coated by spin coating on thebuffer layer of the dried glass substrate on which a strip-shaped ITOelectrode of 2 mm in width has been formed by etching, to form a holetransport layer having a thickness of 0.03 μm. After sufficient drying,sublimation-purified Alq3 (the compound (X-1)) as the light-emittingmaterial placed in a tungsten board is vapor-deposited on the holetransport layer under vacuum, to form a light-emitting layer having athickness of 0.05 μm. The degree of vacuum then is 10⁻⁵ Torr, and theboard temperature is 300° C. In addition, a 5% dichloroethane solutioncontaining the charge-transporting polyester (52) prepared inPreparative Example 2 above as the electron-transporting material isprepared, filtered through a 0.1-μm PTFE filter, and coated on thelight-emitting layer by spin coating, to form an electron transportlayer having a thickness of 0.03 Finally, a Mg—Ag alloy is co-depositedthereon to form a back electrode having a width of 2 mm and a thicknessof 0.15 μm such that the back electrode intersects with the ITOelectrode. The effective area of the organic EL device formed is 0.04cm².

Example 10

An organic EL device is formed in the same manner as Example 9, exceptthat a 5% chlorobenzene solution containing a light-emitting polymer(the compound (XIX), polyfluorene-based) (Mw: ca. 10⁵) as thelight-emitting material is prepared, filtered through a 0.1-μmpolytetrafluoroethylene (PTFE) filter, and coated by spin coating toform a light-emitting layer having a thickness of 0.03 μm.

Example 11

An organic EL device is formed in the same manner as Example 10, exceptthat a 5% chlorobenzene solution containing the charge-transportingpolyester (57) prepared in Preparative Example 3 as thehole-transporting material is prepared, filtered through a 0.1-μmpolytetrafluoroethylene (PTFE) filter, and coated on the buffer layer byspin coating to form a hole transport layer having a thickness of 0.01μm.

Example 12

A dried glass substrate of 2 mm in width on which an strip-shaped ITOelectrode has been formed by etching is cleaned by ultrasonication inthe same manner as in Example 8. A 5% chlorobenzene solution containingthe charge-transporting polyester (57) prepared in Preparative Example 3as the hole-transporting material is prepared, filtered through a 0.1-μmpolytetrafluoroethylene (PTFE) filter, and coated on the buffer layer byspin coating on the glass substrate to form a hole transport layerhaving a thickness of 0.01 μm. After sufficient drying,sublimation-purified Alq3 (the compound (X-1)) as the light-emittingmaterial placed in a tungsten board is vapor-deposited on the holetransport layer under vacuum, to form a light-emitting layer having athickness of 0.05 μm. The degree of vacuum then is 10⁻⁵ Torr, and theboard temperature is 300° C. Finally, a Mg—Ag alloy is co-depositedthereon to form a back electrode having a width of 2 mm and a thicknessof 0.15 μm such that the back electrode intersects with the ITOelectrode. The effective area of the organic EL device formed is 0.04cm².

Example 13

An organic EL device is formed in the same manner as Example 12, exceptthat a 5% chlorobenzene solution containing a light-emitting polymer(following compound (XX), PPV-based) (Mw: ca. 10⁵) as the light-emittingmaterial is prepared, filtered through a 0.1-μm polytetrafluoroethylene(PTFE) filter, and coated by spin coating to form a light-emitting layerhaving a thickness of 0.03 μm.

Example 14

A dried glass substrate of 2 mm in width on which an strip-shaped ITOelectrode has been formed by etching is cleaned by ultrasonication inthe same manner as in Example 8. A 10% chlorobenzene solution containing0.5 part of the charge-transporting polyester (27) prepared inPreparative Example 4 and 0.1 part of the light-emitting polymer(compound (XX), PPV-based) (Mw: ca. 10⁵) as the charge-transportingmaterials is prepared, filtered through a 0.1-μm polytetrafluoroethylene(PTFE) filter, and coated by spin coating on the glass substrate, toform a light-emitting layer having electric charge-transporting abilityand having a thickness of 0.05 μm. Finally, a Mg—Ag alloy isco-deposited thereon to form a back electrode having a width of 2 mm anda thickness of 0.15 μm such that the back electrode intersects with theITO electrode. The effective area of the organic EL device formed is0.04 cm².

Example 15

A dried glass substrate of 2 mm in width on which an strip-shaped ITOelectrode has been formed by etching is cleaned by ultrasonication inthe same manner as in Example 8. A 10% chlorobenzene solution containing0.5 part of the charge-transporting polyester (71) prepared inPreparative Example 5 and 0.1 part of the light-emitting polymer(compound (XX), PPV-based) (Mw: ca. 10⁵) as the charge-transportingmaterials is prepared, filtered through a 0.1-μm polytetrafluoroethylene(PTFE) filter, and coated by spin coating on the glass substrate, toform a light-emitting layer having electric charge-transporting abilityand having a thickness of 0.05 μm. Finally, a Mg—Ag alloy isco-deposited thereon to form a back electrode having a width of 2 mm anda thickness of 0.15 μm such that the back electrode intersects with theITO electrode. The effective area of the organic EL device formed is0.04 cm².

Example 16

A dried glass substrate of 2 mm in width on which an strip-shaped ITOelectrode has been formed by etching is cleaned by ultrasonication inthe same manner as in Example 8. A 10% chlorobenzene solution containing0.5 part of the charge-transporting polyester (75) prepared inPreparative Example 6 and 0.1 part of the light-emitting polymer(compound (XX), PPV-based) (Mw: ca. 10⁵) as the charge-transportingmaterials is prepared, filtered through a 0.1-μm polytetrafluoroethylene(PTFE) filter, and coated by spin coating on the glass substrate, toform a light-emitting layer having electric charge-transporting abilityand having a thickness of 0.05 μm. Finally, a Mg—Ag alloy isco-deposited thereon to form a back electrode having a width of 2 mm anda thickness of 0.15 μm such that the back electrode intersects with theITO electrode. The effective area of the organic EL device formed is0.04 cm².

Example 17

A glass substrate of 2 mm in width on which an strip-shaped ITOelectrode has been formed by etching is ultrasonicated sequentially in aneutral detergent solution, ultrapure water, acetone (for electronicindustry, manufactured by Kanto Kagaku), and 2-propanol (for electronicindustry, manufactured by Kanto Kagaku) in that order for five minuteseach, whereby the glass substrate is cleaned; and, after drying, a 5%chlorobenzene solution containing a light-emitting polymer (the abovecompound (XIX), polyfluorene-based) (Mw: ca. 10⁵) as the light-emittingmaterial is prepared, filtered though a 0.1-μm polytetrafluoroethylene(PTFE) filter, and coated thereon by inkjet printing method, to form alight-emitting layer having a thickness of 0.03 μm. After sufficientdrying, a 5% dichloroethane solution containing the charge-transportingpolyester (13) prepared in Preparative Example 1 above as theelectron-transporting material is prepared, filtered though a 0.1-μmPTFE filter, and coated on the light-emitting layer by inkjet printingmethod, to form an electron transport layer having a thickness of 0.03μm. Finally, a Mg—Ag alloy is co-deposited thereon to form a backelectrode having a width of 2 mm and a thickness of 0.15 μm such thatthe back electrode intersects with the ITO electrode. The effective areaof the organic EL device formed is 0.04 cm².

Comparative Example 2

A glass substrate of 2 mm in width on which an strip-shaped ITOelectrode has been formed by etching is ultrasonicated sequentially in aneutral detergent solution, ultrapure water, acetone (for electronicindustry, manufactured by Kanto Kagaku), and 2-propanol (for electronicindustry, manufactured by Kanto Kagaku) in that order for five minuteseach, whereby the glass substrate is cleaned; and, after drying, a 5%chlorobenzene solution containing a light-emitting polymer (the abovecompound (XIX), polyfluorene-based) (Mw: ca. 10⁵) as the light-emittingmaterial is prepared, filtered though a 0.1-μm polytetrafluoroethylene(PTFE) filter, and coated thereon by spin coating, to form alight-emitting layer having a thickness of 0.03 μm. After sufficientdrying, an electron transport layer having a thickness of 0.05 μm madeof the compound (VIII-1) as the electron-transporting material is formedby vacuum deposition. Finally, a Mg—Ag alloy is co-deposited thereon toform a back electrode having a width of 2 mm and a thickness of 0.15 μmsuch that the back electrode intersects with the ITO electrode. Theeffective area of the organic EL device formed is 0.04 cm².

Comparative Example 3

A dried glass substrate of 2 mm in width on which an strip-shaped ITOelectrode has been formed by etching is cleaned by ultrasonication inthe same manner as in Comparative Example 2. A hole transport layerhaving a thickness of 0.05 μm made of the compound (IX-2) as thehole-transporting material, a light-emitting layer having a thickness of0.065 μm made of the sublimation-purified Alq3 (the compound (X-1)) asthe light-emitting material, and an electron transport layer having athickness of 0.05 μm made of the compound (VIII-1) as theelectron-transporting material are formed in that order on the glasssubstrate. Finally, a Mg—Ag alloy is co-deposited thereon to form a backelectrode having a width of 2 mm and a thickness of 0.15 μm such thatthe back electrode intersects with the ITO electrode. The effective areaof the organic EL device formed is 0.04 cm².

Comparative Example 4

A dried glass substrate of 2 mm in width on which an strip-shaped ITOelectrode has been formed by etching is cleaned by ultrasonication inthe same manner as in Comparative Example 2. A hole transport layerhaving a thickness of 0.05 μm made of the compound (IX-2) as thehole-transporting material is formed on the glass substrate by vacuumdeposition. Then, a 5% chlorobenzene solution containing thelight-emitting polymer (the compound (XX), PPV-based) (Mw: ca. 10⁵) asthe light-emitting material is prepared. The chlorobenzene solution wasfiltered through a 0.1-μm polytetrafluoroethylene (PTFE) filter, and wascoated on the hole transport layer by spin coating, and was sufficientlydried to form a light-emitting layer having a thickness of 0.03 μm. Anelectron transport layer having a thickness of 0.05 μm made of thecompound (VIII-1) as the electron-transporting material is formed byvacuum deposition. Finally, a Mg—Ag alloy is co-deposited thereon toform a back electrode having a width of 2 mm and a thickness of 0.15 μmsuch that the back electrode intersects with the ITO electrode. Theeffective area of the organic EL device formed is 0.04 cm².

Comparative Example 5

A dried glass substrate of 2 mm in width on which an strip-shaped ITOelectrode has been formed by etching is cleaned by ultrasonication inthe same manner as in Comparative Example 2. A hole transport layerhaving a thickness of 0.05 μm made of the compound (IX-2) as thehole-transporting material and a light-emitting layer having a thicknessof 0.065 μm made of sublimation-purified Alq3 (compound (X-1)) as thelight-emitting material are formed on the glass substrate by vacuumdeposition in this order. Finally, a Mg—Ag alloy is co-deposited thereonto form a back electrode having a width of 2 mm and a thickness of 0.15μm such that the back electrode intersects with the ITO electrode. Theeffective area of the organic EL device formed is 0.04 cm².

Comparative Example 6

A dried glass substrate of 2 mm in width on which an strip-shaped ITOelectrode has been formed by etching is cleaned by ultrasonication inthe same manner as in Comparative Example 2. A hole transport layerhaving a thickness of 0.05 μm made of the compound (IX-2) as thehole-transporting material is formed on the glass substrate by vacuumdeposition. Then, a 5% chlorobenzene solution containing alight-emitting polymer (the compound (XX), PPV-based) (Mw≈105) as thelight-emitting material is prepared, filtered through a 0.1-μmpolytetrafluoroethylene (PTFE) filter, coated by spin coating, and driedsufficiently to form a light-emitting layer having a thickness of 0.03μm. Finally, a Mg—Ag alloy is co-deposited thereon to form a backelectrode having a width of 2 mm and a thickness of 0.15 μm such thatthe back electrode intersects with the ITO electrode. The effective areaof the organic EL device formed is 0.04 cm².

Comparative Example 7

A dried glass substrate of 2 mm in width on which an strip-shaped ITOelectrode has been formed by etching is cleaned by ultrasonication inthe same manner as in Comparative Example 2. A 10% dichloroethanesolution containing 1 part of the compound (IX-2) as thehole-transporting material, 1 part of the sublimation-purified Alq3 (thecompound (X-1)) as the light-emitting material, and 1 part of polymethylmethacrylate (PMMA) as the binder resin is prepared, filtered through a0.1-μm polytetrafluoroethylene (PTFE) filter, and coated on the glasssubstrate by dipping, to form a light-emitting layer having electriccharge-transporting ability and having a thickness of 0.05 μm. Finally,a Mg—Ag alloy is co-deposited thereon to form a back electrode having awidth of 2 mm and a thickness of 0.15 μm such that the back electrodeintersects with the ITO electrode. The effective area of the organic ELdevice formed is 0.04 cm².

(Evaluation)

A DC voltage is applied to each of the obtained organic EL devices withthe ITO electrode serving as the positive electrode and the Mg—Ag sideserving as the negative electrode under vacuum [133.3×10⁻³ Pa (10⁻⁵Torr)]. The start-up voltage, the maximum brightness, and the drivecurrent density at the maximum brightness are determined, and themeasurement results are summarized in the following Table.

The emission lifetime of each organic EL device is also determined underdry nitrogen. In measurement of the emission lifetime, the time thebrightness takes to decline from the initial value to half of theinitial value when operated with a small current that gives an initialbrightness of 50 cd/cm² is designated as the device lifetime (hour). Thedevice lifetime determined is also shown in the following Table.

TABLE 71 Start-up Maximum Drive current Device voltage brightnessdensity lifetime (cd/m²) (cd/m²) (mA/m²) (hour) Example 8 4.1 1065 7.378 Example 9 3.8 1079 7.0 88 Example 10 4.2 1055 6.5 74 Example 11 3.81047 7.2 69 Example 12 4.0 1036 7.0 68 Example 13 3.6 1088 6.4 90Example 14 3.6 1072 6.6 75 Example 15 3.7 1030 6.5 74 Example 16 3.91025 6.9 86 Example 17 4.0 998 7.5 75 Comparative 4.4 800 7.6 33 Example2 Comparative 4.7 980 6.8 45 Example 3 Comparative 3.9 1010 7.5 48Example 4 Comparative 4.7 860 7.9 39 Example 5 Comparative 4.4 900 7.634 Example 6 Comparative 6.2 680 10.7 35 Example 7

The results in Table 71 reveal that each of the charge-transportingpolyesters having a repeating structure containing at least onestructure selected from the structures represented by formulae (I-1) and(I-2) as the partial structure has an ionization potential and a chargemobility suitable for use in organic electroluminescent devices and maygive a favorable thin film, for example, by spin coating or dipping. Thecharge-transporting polyesters also raise charge injecting andtransporting efficiency, and thus, may give a thin film improved inelectric charge balance and consistently superior in brightness andefficiency. Thus, the organic electroluminescent devices according to anaspect of the invention are free from defects such as pinholes, allowseasy expansion in size and shows excellent durability and light emissioncharacteristics.

The foregoing description of the exemplary embodiments of the presentinvention has been provided for the purposes of illustration anddescription. It is not intended to be exhaustive or to limit theinvention to the precise forms disclosed. Obviously, many modificationsand variations will be apparent to practitioners skilled in the art. Theexemplary embodiments were chosen and described in order to best explainthe principles of the invention and its practical applications, therebyenabling others skilled in the art to understand the invention forvarious embodiments and with the various modifications as are suited tothe particular use contemplated. It is intended that the scope of theinvention be defined by the following claims and their equivalents.

All publications, patent applications, and technical standards mentionedin this specification are herein incorporated by reference to the sameextent as if each individual publication, patent application, ortechnical standard was specifically and individually indicated to beincorporated by reference.

1. An organic electroluminescent device comprising a pair of electrodescomposed of an anode and a cathode, and one or more organic compoundlayers disposed therebetween, at least one of the anode or the cathodebeing transparent or semitransparent; at least one of the organiccompound layers including a charge-transporting polyester having arepeating structure containing at least one structure selected from thestructures represented by the following formulae (I-1) and (I-2) as apartial structure:

in formulae (I-1) and (I-2), Ar representing an unsubstituted monovalentphenyl group, an unsubstituted monovalent polynuclear aromatichydrocarbon having 2 to 10 aromatic rings, an unsubstituted monovalentfused aromatic hydrocarbon having 2 to 10 aromatic rings, or anunsubstituted monovalent aromatic heterocyclic ring; X representing agroup represented by the following formula (II); T representing abivalent straight-chain hydrocarbon group having 1 to 6 carbon atoms; krepresenting O; and l representing 1:

in formula (II), R¹ and R² each independently representing a hydrogenatom, a substituted or unsubstituted alkyl group, a substituted orunsubstituted aryl group, or a substituted or unsubstituted aralkylgroup; and n representing an integer of 1 to
 10. 2. The organicelectroluminescent device according to claim 1, wherein T represents—CH₂CH₂—.
 3. The organic electroluminescent device according to claim 1,wherein the charge-transporting polyester having a repeating structurecontaining at least one structure selected from the structuresrepresented by the formulae (I-1) and (I-2) as a partial structure is acharge-transporting polyester represented by the following Formula(III-1) or (III-2):

in formulae (III-1) and (III-2), Y and Z each independently representinga bivalent hydrocarbon group; B and B′ each independently representing—O—(Y—O)_(m)—H or —O—(Y—O)_(m)—CO—Z—CO—OR′; R and R′ each independentlyrepresenting a hydrogen atom, a substituted or unsubstituted alkylgroup, a substituted or unsubstituted aryl group, or a substituted orunsubstituted aralkyl group; m representing an integer of 1 to 5, prepresenting an integer of 5 to 5,000; and A representing at least oneof the structures represented by the formulae (I-1) and (I-2).
 4. Theorganic electroluminescent device according to claim 1, wherein theorganic compound layers include a light-emitting layer and an electrontransport layer, and at least one of the light-emitting layer or theelectron transport layer includes the charge-transporting polyesterhaving a repeating structure containing at least one structure selectedfrom the structures represented by the formulae (I-1) and (I-2) as apartial structure.
 5. The organic electroluminescent device according toclaim 4, wherein the light-emitting layer includes a charge-transportingmaterial that is different from the charge-transporting polyester. 6.The organic electroluminescent device according to claim 1, wherein theorganic compound layers include a hole transport layer, a light-emittinglayer, and an electron transport layer, and at least one of the holetransport layer, the light-emitting layer, or the electron transportlayer includes the charge-transporting polyester having a repeatingstructure containing at least one structure selected from the structuresrepresented by the formulae (I-1) and (I-2) as a partial structure. 7.The organic electroluminescent device according to claim 6, wherein thelight-emitting layer includes a charge-transporting material that isdifferent from the charge-transporting polyester.
 8. The organicelectroluminescent device according to claim 1, wherein the organiccompound layers comprise a light-emitting layer having an electriccharge-transporting ability, the light-emitting layer includes thecharge-transporting polyester having a repeating structure containing atleast one structure selected from the structures represented by theformulae (I-1) and (I-2) as a partial structure, and the organicelectroluminescent device further includes a buffer layer disposedbetween the light-emitting layer having the electric charge-transportingability and the anode.
 9. The organic electroluminescent deviceaccording to claim 8, wherein the light-emitting layer includes acharge-transporting material that is different from thecharge-transporting polyester.